|"I have a bottom mounted power supply"|
One of the problems with the bottom mount design is that the heat from the PSU rises. And what generally sits directly above it? Yup, the graphics card.
"Moving the power supply to the bottom of the case has several negative effects. First, it takes the power supply’ fan away from the top, so that another fan has to be used to remove case heat, adding noise. Second, it makes cable management more difficult, often times with the ATX12V cable not reaching its motherboard connector. Third, as the power supply casing warms up, it heats the graphics cards."
"i already have 2 case funs running"
I assume the front fan is an intake (blowing cool air into the case) & the rear is an exhaust (sucking warm air out of the case)? If not, that is how they should be configured.