Make sure your throttle hold is not on a different bank.
I wonder how your TH could be mixed with another channel that is switching to another bank where the swash is not levelled. Whatever it is, a good recommendation is to copy the bank where you set up the Vbar to all others. Then you can add your changes later if you like. This way you are sure you don't miss something.
If it were the radio it appears like an input rather than a gain issue. Check if you have any mix or trim.
FYI I don't use banks. Dual rates and tail gain from the radio are enough for me. And simpler.
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