Hey Brendan,
I think you'll find you only THINK you've found the bike's limits.
When you do the track day you'll find yourself proven wrong.
The only real strong reason I upgraded from my 250 was physical size - I was too cramped. Yes of course the whole engine size and faster in a straight line arguments were factors, I won't deny that. But the fact was that the 250 was so agile it could beat most everything else through the corners - it was just uncomfortable.
It's a shame I didn't follow you all back down the oph on Sunday - you really only saw the postie on the uphill section. The downhill on the way back would've shown you a thing or two about small bikes

Stick with the 250, do the track a couple of times.
There isn't much around to do technically to the 250s as people don't keep them long enough for mods to be cost effective. Better off to stick with it and upgrade to a 600 when you're allowed.
ty
If you have no fear, you're not going fast enough.
Never argue with an idiot. He'll drag you down to his level, then beat you with experience.