Are you actually having trouble installing it, or is it just that the shelf overlaps the fan? I have the exact same set up (with the FC model), and there is overlap, but the case has such good airflow, I never bothered about it. With 3 PCP&C Silencers, the mobo sensor is only a few degrees farenheit above room temperature. I know on the older Enermax's the inside fan guard does stick down farther, but you could also remove it, install the PSU, and then put the screws back in, with or without (if it interferes too much) the fan guard. I had to do that when I installed the PSU in a Lian Li but I could then screw the whole thing back together with the guard.