In order to any of this to work correctly you will need to be careful or you could end up with less power!
The problem with a quench or squish band that is too large (i.e to big a gap) is that the fresh charge that is trapped in this area does not burn until well after TDC by which time it is too late for it to help in the process of creating useful pressure above the piston. The too large a gap basically does not move the fresh charge into the combustion chamber and stops the flame front from getting at the trapped charge. In this instance the engine would be better off with no squish band at all so the dished pistons actually help the standard RV8 because the charge gets exposed to the flame front. The lack of any decent sized squish band does mean that the CR is limited to a lower figure in order to prevent the 'end gases' detonating.
From my experience of messing about with bike engines and from what I've read the piston needs to be at most 1mm from the head but this depends on the size of the pistons, conrod strength, bearing clearance and the RPM that the engine must operate at. (The clearance could end up being less when the engine is running) Get the gap too small and you will blow the motor! How much smaller this gap gets on an RV8...who knows?
My guess would be to go for a squish band of around 1.0-1.2mm (Which will reduce at high RPM) and then hollow out each chamber to give a CR of around 10.5:1. I guess the timing could be pulled back a bit because the rate of combustion should be a bit higher.
Valve clearance would need looking at too!
All just my humble!
(Good question BTW)
