H100i SP120 vibration 750D

I've posted here a million times and I still can't figure this out. I have my H100i mounted in the top of my 750d, in a push pull setup using the SP120 HP PWM fans. No matter which way I install them (different screw methods) I still get this very annoying vibration. I've even added rubber mounts that came with the case. NOTHING... I can't tell if it's the top two fans vibrating off the radiator, or if it's the top fans vibrating on my case. however, when I press down on the top of the case, the noise slightly goes away, and sometimes it will be gone until I remove my finger. Upon startup of my computer, it will make an annoying vibration sound as if it's clinging to metal. PLEASE PLEASE PLEASE I HOPE SOMEONE HAS HAD THIS PROBLEM IN THE PAST, SO I CAN BE HELPED. IVE BEEN DEALING WITH THIS FOR TWO MONTHS, AND ITS MAKING ME PARANOID... This noise only happens around ~1300rpm and sometimes it will happen at different speeds, but always at 1300.





I've had RMA'd my h100i twice (different reasons) and RMA'd my fans like 6 times (due to the strong force needed to install-- stripped out screw holes, and grinding sounds), so I know it's not the fans. My only belief would be the case.