hmm even though you are correct on the part that expert doesnt play well with TCCD/TCC5 (loose latency/high frequency), i have to point a few things out:
AFAIK and IMHO, the reason expert is having issues with TCCD/5 clocking is not because of the changed memory VR. it had something to do with the type of traces that had been put on the expert.
also, venus has FIXED those issues with TCCD/5 and now people are back to breaking mad records (onepagebook and his half broken english + DDR640 @ 2.5-4-4-8 
) iirc the bios are also compatible. most prominently the recent 03/30 Venus bios release.
