An interesting side bar regarding handling, and tire sizes... One article I read a few years ago, stated that an owner was changing his tires out due to wear. He decided to take a chance, and put the recommended tire width back on, so it would match OEM specifications. He commented he always replaced OEM with wider tires, thinking it would handle better, particularly in corners.
He stated he was quite shocked that his bike, with the narrower, OEM spec'ed tires on, handled much better than it had with the wider tires... He stated he was afraid the bike would 'fall into corners', with the narrower tires. Instead, the bike handled much better than he remembered it ever handling. He stated that 'perhaps the manufacturer knew more than he thought' about what size tires to put on that bike.
I confess, I run wider than what is spec'ed on my Honda. I, too, would be interested in trying out tires that matched exactly what Honda specified, originally.
Any changes made to the bike, will change the handling -- most likely away from optimal, but then, again, the OEM designed them for an "average rider" with 'average' height, weight, and build. If it works, and it is safe, then go for it. The hard part is finding out if it is, in fact, safe. Cheers!
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII