I'm using the stock plate and it's made a slight difference but still not enough to totally cure the overheating VRMs. I wish I could get hold of a think enough copper plate from some where, then I could get my mate to knock up a copy onfthe stock plate as he as access to CNC, lathes and milling machines.

Or maybe just a copper shim between the plate and VRM's in place of the thermal pad might help?