i am not sure which tt youre using geoff. but one of the things i wnat to try is the ttweights periphery ring. that would add lots of effective inertia to the formula in addition to help flatten the record of warps.

i have various weight/clamps-sota reflex, maplenoll clamp, planamax lightweight clamp, and an orsonic reflex clamp (small and not so heavy). the reflex clamps help with warps to a degree but the periphery clamp has many advantages.

i only wish i had one at this time.

http://www.ttweights.com/rings.html