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LTC3723-1 LTspice simulation problem with Fsw above 390kHz

The LTspice model for the LTC3723 doesn't produce driver outputs above 390kHz. 

Even starting with the macromodel's test fixture and, and changing only C1 to 40pF-80pF, reproduces the same aberrant behavior as I encountered in my attempts to model my design.  Following is the actual LTspice design file I am using. Please note that the feedback path was disconnected to coax the highest duty cycle the LTC3723 could produce at 1MHz.

LTC3723-1 Push Pull Controller TEST.asc