I want an array formula to use with Google Forms data to automatically calculate running metrics on my data.
In this case, in column BF I want it to auto-calculate whenever new responses come in.
I'm trying to use this formula below but isn't working for all column, just for the first line.
=ArrayFormula(If(isblank($BF$3:$BF);"";(INDEX($C$1:$BD$1;0;MATCH(MAX($C3:$BD3);$C3:$BD3;0)))))

What I'm doing wrong?
My Google Sheet:
https://docs.google.com/spreadsheets/d/1iD75djqdY8qtClEHpKUEvAS55bP0ARv9AnDUz9mFBuc/edit?usp=sharing
