Nathan: Could run a tad cooler at the lower settings, but the biggest thing to watch out for at the higher settings is detonation if you use car gas, especially with your higher compression. I'm guessing here but you would have to be in the 35 +degree range for detonation to occur with avgas. Slightly more power with more advance. Changed my 65 from 30/30 to 28/28 and saw around 25 rpm less at full throttle. Since the mags are going back on tomorrow, you can bet your a$$ it will be back to 30/30 for sure. An engine expert told me that dropping to 28/28 would make run a little cooler without effecting power. Definition of an expert= has been/drip under pressure. He was wrong one the one part.
How are your mags wired? Left mag fires two bottom and two top and right mag the same way or are they wired to fire left mag bottoms and right mag tops? This has a bearing on settings. If each mag is set to fire two tops and two bottoms, the timing should be the same for both mags. If the left fires the bottoms only the normal way is to set them at different degrees. Since nobody has successfully explained this rational to me, I also set both mags to the same advance an it works great. Some crap about swirl patterns in the chamber requiring more advance on the bottoms to even things out. Ya right, whatever. Follow that thinking to the two tops and two bottoms per mag and figure out why two settings are used. Now apply common sense and set them accordingly.
Man, that engine will be gutless when you back the timing off
Ron
Before you believe anything I say, check with two more people. If they agree, I must be right.
). 
. Withdrawl symptoms are bad .
Well, if it's any consilation, it was really hot and I had to take the door off to keep cool. 
Maybe, when I need that little extra kick, I'll check the timing again.