This thread should actually be split because after I have learned more about my Rocket innards, I know that there is no way you can get another 6th gear out of clutch replacements alone.
The subject should read "Heavy Duty Clutch" and "6 Speed Transmission".
The transmission is where all the gearing and shifting mechanisms are.
The clutch is the stuff that connects and disconnects the engine's main crank gear to the transmission.
I'd like to report on the Barnett clutch parts, but because it was over a month since I rode in stock configuration it's hard for me to gauge the differences in how the clutch works. All I can say is it seems to feel smoother and "bites more aggressively" but how much is due to the Barnett parts or to the engine overhaul, I don't know.