unfortunately i just had a big "spring clean" and gave away all the extra stuff i didnt need anymore to people that needed them, including several fans I think the PC is getting enough air at low RPM so i'll live with it. For people doing the same build: DO NOT GO FOR NF-a12x15 in this case, use a NF-F instead. I have done some digging and im not the only one with this problem with those fans in this case- can be that both is a bad combo. Turbulence, bad flow, i dunno. Works fine outside the case.
But thanks for you time all!