another no on the TB. the only time a larger tb helps is WOT at high rpm, unless youve done alot already to help your engine breathe, it might not even help at all.
the feeling of increased throttle response from a larger TB is in perception only. with a larger tb opening the throttle 25% way feels like opening a stock tb 30% or so.... because thats what its equal to in air flow. anyone that likes this throttle response would be better served stabbing the gas pedal a little harder and faster.
i've been there done that... few years ago,modded an 89 camaro about as fast as one could be w/ stock heads and no power adders. larger TB was the biggest waste of money i've had on any vehicle mod ever. i think i actually got worse mileage with the big tb. larger tb makes it more difficult to modulate the throttle because it lets more air in faster, twice as bad in an overpowered vehicle. i was always touching the throttle, tring to back off, coasting, getting on the throttle some...
Moisture means it depends on where you live. Here, humidity is regularly under 30% most of the year and I can tell you with utmost certainty that the wrap isn't holding on to ANY moisture at operating temps no matter where you are. So it's only a problem in moist climates I'd assume.