Glad you are enjoying your H90!
Can you try calibrating your aux switch using the pedal UI? This is different than just selecting the aux switch from H90 Control. To do this, go to System > I/O > Exp & Aux and turn Quick Knob 3 to calibrate the aux pedal. If you are still having issues, please be more specific about what aux switches you are using.
There is no “Init Preset” for a starting point, you’ll have to choose a Factory Preset and edit it as you have been doing.
Let me know if you have any other questions.