I had the same complaints. It was a long journey but the following has 100% transformed my driving/clutch experience.
a) change fluid often, 1-2 times per month, 1 $5 can from auto parts store
b) remove helper spring
c) installed clutch return spring
d) mgw shifter
e) Amsoil mtg fluid swap
f) jhr stainless replacement line.
g) bleed brake system every 5k miles.
With all that, i'm able to shift at 7500 routinely on motor and on nitrous and have 0 nibble or cold shift issues.
Hope that helps
I did all that (except remove the helper spring) and my MT-82 broke. :uh oh:
Do you track your car or just DD?