We put two LTM4623 in parallel and are getting a persistent ~30kHz ripple of ~25mV out. Any ideas why? We set to 3.9V and use external sync at 2MHz. We feel we followed the data sheet design & layout instructions quite closely. We're gonna try piling on Cin & Cout. Is it worth trying other things we see on the 2171A Demo Bd: 2.2uF on IntVcc; a RC LPF from Vin to SVin; & a cap parallel to the Feedback resistor? Thanks!