Just taken the internals out of my TX200 Mk1 and put them in my TX200HC if that counts....
Seems OK at 10.5 ft-lb. Only had a chance to test at 20 yards so far though. Groups are the same as before with the mk3 internals. Need to do a bit of pellet testing at longer range to see if I can gain anything. Otherwise its going back to how it was.

This is my HFT gun so not too fussed about how it feels, just where the pellets end up