ADRV9009-ZU11EG Multi-SOM: 3 SOMs delayed from other 3

I'm running 6 SOMs (without FMCOMMS8) simultaneously, following the multi-SOM guide here.

I'm finding that when I run multi.rx, the second, third, and fifth SOMs are all delayed by approximately 138ns.  So what I have is one set of 3 that are in sync, and another set of 3 that are in sync but delayed.

I've tried adding adding a coarse digital delay in the devicetree and that seemed to make no difference.

I've also tried using the multi.hmc7044_ext_output_delay() function within my python script, which also seems to make no difference.

Noting that my VCO frequency is 122.88 MHz, the 138ns delay I'm seeing would appear to be 17 cycles, which leads me to believe this is related to the coarse digital delay.

Here's the portion of my primary device tree that pertains to hmc7044-ext:

			hmc7044-ext@4 {
				#address-cells = < 0x01 >;
				#size-cells = < 0x00 >;
				#clock-cells = < 0x01 >;
				compatible = "adi,hmc7044";
				reg = < 0x04 >;
				spi-max-frequency = < 0xf4240 >;
				adi,pll1-clkin-frequencies = < 0x00 0x1d4c000 0x00 0x00 >;
				adi,pll1-loop-bandwidth-hz = < 0xc8 >;
				adi,pfd1-maximum-limit-frequency-hz = < 0x3a9800 >;
				adi,vcxo-frequency = < 0x7530000 >;
				adi,pll2-output-frequency = < 0xafc80000 >;
				adi,sysref-timer-divider = < 0xf00 >;
				adi,pulse-generator-mode = < 0x01 >;
				adi,oscin-buffer-mode = < 0x15 >;
				adi,clkin1-buffer-mode = < 0x07 >;
				adi,sync-pin-mode = < 0x01 >;
				adi,gpi-controls = < 0x00 0x00 0x00 0x00 >;
				adi,gpo-controls = < 0x1f 0x2b 0x00 0x00 >;
				clock-output-names = "hmc7044_e_out0_REFCLK_OUT0\0hmc7044_e_out1_SYNC_OUT0\0hmc7044_e_out2_REFCLK_OUT1\0hmc7044_e_out3_SYNC_OUT1\0hmc7044_e_out4_REFCLK_OUT2\0hmc7044_e_out5_SYNC_OUT2\0hmc7044_e_out6_REFCLK_OUT3\0hmc7044_e_out7_SYNC_OUT3\0hmc7044_e_out8_REFCLK_OUT4\0hmc7044_e_out9_SYNC_OUT4\0hmc7044_e_out10_REFCLK_OUT5\0hmc7044_e_out11_SYNC_OUT5\0hmc7044_e_out12_REFCLK_OUT6\0hmc7044_e_out13_SYNC_OUT6";
				jesd204-device;
				#jesd204-cells = < 0x02 >;
				jesd204-sysref-provider;
				adi,hmc-two-level-tree-sync-en;
				phandle = < 0x25 >;

				channel@0 {
					reg = < 0x00 >;
					adi,extended-name = "REFCLK_OUT0";
					adi,divider = < 0x60 >;
					adi,driver-mode = < 0x01 >;
					phandle = < 0x95 >;
				};

				channel@2 {
					reg = < 0x02 >;
					adi,extended-name = "REFCLK_OUT1";
					adi,divider = < 0x60 >;
					adi,driver-mode = < 0x01 >;
					phandle = < 0x96 >;
				};

				channel@5 {
					reg = < 0x05 >;
					adi,extended-name = "SYNC_OUT2";
					adi,divider = < 0xf00 >;
					adi,driver-mode = < 0x03 >;
					adi,startup-mode-dynamic-enable;
					adi,high-performance-mode-disable;
					adi,driver-impedance-mode = < 0x03 >;
					phandle = < 0x97 >;
				};

				channel@6 {
					reg = < 0x06 >;
					adi,extended-name = "REFCLK_OUT3";
					adi,divider = < 0x60 >;
					adi,driver-mode = < 0x01 >;
					phandle = < 0x98 >;
				};

				channel@11 {
					reg = < 0x0b >;
					adi,extended-name = "SYNC_OUT5";
					adi,divider = < 0xf00 >;
					adi,driver-mode = < 0x03 >;
					adi,startup-mode-dynamic-enable;
					adi,high-performance-mode-disable;
					adi,driver-impedance-mode = < 0x03 >;
					phandle = < 0x99 >;
				};

				channel@1 {
					reg = < 0x01 >;
					adi,extended-name = "SYNC_OUT0";
					adi,divider = < 0xf00 >;
					adi,driver-mode = < 0x03 >;
					adi,startup-mode-dynamic-enable;
					adi,high-performance-mode-disable;
					adi,driver-impedance-mode = < 0x03 >;
					phandle = < 0x9a >;
				};

				channel@3 {
					reg = < 0x03 >;
					adi,extended-name = "SYNC_OUT1";
					adi,divider = < 0xf00 >;
					adi,driver-mode = < 0x03 >;
					adi,startup-mode-dynamic-enable;
					adi,high-performance-mode-disable;
					adi,driver-impedance-mode = < 0x03 >;
					phandle = < 0x9b >;
				};

				channel@4 {
					reg = < 0x04 >;
					adi,extended-name = "REFCLK_OUT2";
					adi,divider = < 0x60 >;
					adi,driver-mode = < 0x01 >;
					phandle = < 0x9c >;
				};

				channel@7 {
					reg = < 0x07 >;
					adi,extended-name = "SYNC_OUT3";
					adi,divider = < 0xf00 >;
					adi,driver-mode = < 0x03 >;
					adi,startup-mode-dynamic-enable;
					adi,high-performance-mode-disable;
					adi,driver-impedance-mode = < 0x03 >;
					phandle = < 0x9d >;
				};

				channel@8 {
					reg = < 0x08 >;
					adi,extended-name = "REFCLK_OUT4";
					adi,divider = < 0x60 >;
					adi,driver-mode = < 0x01 >;
					phandle = < 0x9e >;
				};

				channel@9 {
					reg = < 0x09 >;
					adi,extended-name = "SYNC_OUT4";
					adi,divider = < 0xf00 >;
					adi,driver-mode = < 0x03 >;
					adi,startup-mode-dynamic-enable;
					adi,high-performance-mode-disable;
					adi,driver-impedance-mode = < 0x03 >;
					phandle = < 0x9f >;
				};

				channel@10 {
					reg = < 0x0a >;
					adi,extended-name = "REFCLK_OUT5";
					adi,divider = < 0x60 >;
					adi,driver-mode = < 0x01 >;
					phandle = < 0xa0 >;
				};

				channel@12 {
					reg = < 0x0c >;
					adi,extended-name = "REFCLK_OUT6";
					adi,divider = < 0x60 >;
					adi,driver-mode = < 0x01 >;
					phandle = < 0xa1 >;
				};

				channel@13 {
					reg = < 0x0d >;
					adi,extended-name = "SYNC_OUT6";
					adi,divider = < 0xf00 >;
					adi,driver-mode = < 0x03 >;
					adi,startup-mode-dynamic-enable;
					adi,high-performance-mode-disable;
					adi,driver-impedance-mode = < 0x03 >;
					phandle = < 0xa2 >;
				};
			};
		};

Any suggestions?