Yep, the OE size tyres on the VF work really well. I did the 17 inch conversion and apart from being able to access modern rubber, the difference in handling in the dry is hard to detect.
I have it on good athority, though not through personal experience, that those Y2K's take 20 yrears off one's age and add 125% more sex appeal to the pilot, at least until the helmet comes off.