read more, i believe more people state that there is NO power loss than those that reported one.
i've got this done as well, same size drill. i feel no power loss at all.
an example of throttle hang (to my knowledge) would be, say, revving your engine, and as soon as you let off the gas, the throttle sticks at that rpm for a few moments before dropping back. the difference being with the fix is that it will almost immediately dorp back.
again - to my understanding - this is what the throttle hang fix does:
that hose you placed the copper pipe inside allows that small amount of air into the engine while the throttle body is closed, thus controlling your idle. without that hose, your engine will stall. by allowing a smaller amount of air into it, as you close the throttle, your engine is getting a smaller amount of air than if you didn't have that pipe fitting in it, so the rpm's drop back much faster, but not to the point that would cause the engine to stall.
this saves you a very VERY tiny amount in gas if your a 'revver' and just makes your tach look prettier while revving
on a personal note, it's a much more comfortable shift for me. i don't know about anyone else though...
hope that helped, and if anyone can correct anything, please do. like i said, that it how i currently understand it.