When we were running pump fuel , we used 1.1mm squish . The heads have been reprofilled and the squish band retuned and the bike pulled strongly .
When we ran race fuel we used 0.8mm with different profiles again .
Race fuel you bump up the compression to gain midrange , pump fuel you run less compression etc to rev higher to make your hp .
If you help me computerwise i can send you some pics of my old pump fuel 250 heads .

It all depends what you want from the bike and what you intend to do with it , there is free hp waiting for you when you tune the ports and heads . Best hp gain imo