Keep the ATX extension lead to ~30cm re remote sensing (but not on all pins),
you can go a bit longer if the original PSU lead is a short one - but not infinite.

Frankly keep the solution simple:
o Baseline where you are now
o Change 1 variable at a time
o Do not thro money at the solution :-)
o Then establish how the new system compares & adjust accordingly

Treating cause is more effective that effect, although you will find
that treadair rubber underlay (and it's clones) is very effective. The
acoustic sound-barrier-mat, 5kg/m^2 & acoustic foam cost far more.

Typical coloco facilities run CPUs far hotter than most people realise,
but that does not mean you can neglect HD temps - S.M.A.R.T. utils.
--
Dorothy Bradbury
www.stores.ebay.co.uk/panaflofan for quiet Panaflo fans & other items
www.dorothybradbury.co.uk (free delivery)