Well I can feel the expansion chamber kick in at around 22mph and with the 32T it should kick in around 25 or 26. Which my cruising speed is usually about 30-35 so i should be in the power most of the time. If I have to change back then so be it no harm no foul on a $15 part! Probably won't be able to spin the same RPMs like you said because there will be more wind resistance, as well as the higher gearing will make it harder to spin the mass that extra bit. I'd be happy with a couple mph. Current top speed with the 36T sprocket on this motor was 44mph slightly downhill. I'll measure what it is on that same hill to make sure the factors are fouled too much.Same around here with hills, most are long sloping and have good long straight flats leading up to them.
Yes time will tell if you have the grunt to pull the higher gear, sometimes a gear that's to high will choke engine e and you will actually loose top speed but if you have the power to pull it the top speed will increase, wind resistance increases with faster speeds so that an be a limiting factor also.
Once you get her out and going you'll be able to see what you have and if it will be what you want you bike to act like.
Trail and error is part of all this hobby, I'm always looking for that best happy medium where I don't trade to much off on either end.
Map
Going to film this first run so I can swap over the HD lightning system and run the same route wide open so see if there is any differences in that as well.
The chain I also put on is so free moving compared to the old stock chain. This one is a nice quality brand that I bought a few months back on one of the vendors sites. I wouldn't be surprised if that wasn't also keeping me back some as well with the extra gunk and friction it had.