Ulfr,
It could be that you don't like AP. Or it could be that your AP is not in a good spot to produce good fruit.
I have 2 atemoya with the same scion, not AP, planted 25 feet apart. One produces good fruit, the other produces bad fruit.
My cousin next door has 2 different cherimoya, 15' apart. One produces good fruit. The other produces nasty fruit.
Tricky trees.