Compression ratio question

No.
I am not looking for just a change. When we built the engine we used the Pro Comp cast aluminum heads. The thermostat stuck closed one day and before I could pull over it got real hot.
It seems that it did not hurt the engine, everything looks right, good compression test and no leaks, but I am now not comfortable with it. With the new Trick Flow heads coming out late this year and they are billet heads form what I can find. I was thinking about changing the cast heads out for them. They have a smaller combustion chamber which would raise the ratio some. So hence the question.