Is it so difficult to adapt my proposition to your needs?
I'll leave it up to you to add absolute/relative references if that is not asking too much...
=IF(D3="","",IF(SUMPRODUCT((Q3:AG3<69,5)*(Q3:AG3>0 )),"f",LOOKUP(AH3,{69.5,79.5,89.5},{"c","b","a"})) )

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