I believe moving the PSU out of the case is a great idea. It is a source of additional heat, it's blocking airflow, and it is an easy fix to move it out of the case (I think).
Hi funktion. Yeah that's kinda what I was thinking...easy. I think I'll add some complications to the easy sauce though and short an additional PSU and run them in tandem with each shouldering half the load. Might as well give it a shot while I have the cover off. Something similar will be necessary anyway when our batch 3 arrives as it has 4 modules and no included PSU.
Cheers.