... The balance shafts do give it a more smoother sophisticated feel but they will sap some power up.
Yep that's the idea. but, imho, even 'sophisticated feel' is debatable. I removed the belt from mine but haven't locked them so the front one spins to it's heart's content. I can't say it makes a blind bit of difference to the feel.
If you want to physically remove the shafts: according to Guy Croft's forum you have to blank the oil channels to the shafts or it screws up the oil pressure.
BTW:
This question seems to be asked alot. If it's not already, maybe it could do with going into the FAQ.