Hello Bill,
you still have completely messy parameters, which prohibit good ADEV values!
These strange oscillations of pps and DAC value indicate that there's a big problem.
Please run the autotune function, or set EL =20..25°, AMU = 1, TC = 500 sec, Gain ~ 1..2Hz/V, like ArthurDents receiver.
I suppose you meanwhile know, that these parameters can be stored into Thunderbolts EEPROM, so that these are available at startup.
Just a silly idea: Have you made a precise position survey (24..48h) and stored this correctly?
Frank