The above is for the RC version, the CL might be different, if that is what you have.
The stock compression ratio is actually very high, I'm running 3 head shims in mine for 10% nitro fuel (and 20% all castor). So if your engine is over heating that's one more thing to try. You also need to use a smallish prop, the APC 5.7x3 is a good match and I wouldn't recommend any larger loads than that.