That's a very nice looking bike you've got there, you've done all the usual RS bits that need doing, personally I prefer the rectangular headlight as that defines the bike from all the other early eighties bikes but that's just a personal thing.
Other mods you can do are CBX250 wheels, they have a better cush drive, Hagon shocks work well.
Sometimes the oil leak from the head is actually from the O ring on the ends of the rocker shafts, bit of a pig to fix but unavoidable I'm afraid.
They sometimes crack between the spark plug hole and a valve seat but I've known these go go for years before you need to do anything, the generators are a weak spot and lead to intermittent starting, I think WEMOTO list new generators for the RS.
All in all a cracking little bike, I've had five and converted the last one to 500.