Scope advise for a full power np

Hi, need a recomandation for a scope who can keep is poi on a crosman vantage 177 np with close 17 fpe power.

I try a bsa spring rated scope 4x32 mildot one but poi shift. For now, i am more accurate with the toy open sight than the scope.

I check my ring and it was rock solide but the scope gives me like 7-8 good shoots and move on the verticale poi, some shoot after it come back.

I look for something simple like 4x mildot and ao , dont need illumated reticule and gammick .
 
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