I set the squish at 0.8mm
Combustion volume was set at 12.8cc to the top of the spark plug hole.
Not too sure what a "relatively large squish" is, but would guess at 1.0mm?

I have not yet sorted out my jetting and got a dyno graph, so my words here mean nothing I guess.
But, I will get there.

Also:
http://www.nsr250.net/forums/viewtopic.php?t=11421