BTW, the light flywheel does make the bike easier to ride. I've heard the Nichols flywheel described as the "poor man's slipper clutch", and it does have that effect. While the light flywheel makes the bike's compression have more effect at slowing the bike when rolling off the throttle, it also lets the bike's engine spin up faster when you knock down a gear and your rpm is too low for your wheel speed.
IIRC, you had 43 teeth on the rear? That's 4 up from stock 39, that is "two upgrades", and now you're back at 41. I have a 14 front. If I understand you correctly this will suffice.If you want better wheelies on top of that, add a couple of teeth to the rear sprocket. The effect that I found with the FCRs was that I could take those two teeth back off the rear sprocket, still have better bottom end than the stock gear ratio and get the top end back that I lost with the larger sprocket.