I am at exactly 12.8 at WOT so that is good. This is important as you say to get power
Cruise now at 15 and it runs fine there too. Lean stuttering now gone at cruise which was priority. Much better than it was. I only cut off two coils from the springs but it was an improvement. Supports the vacuum theory. Might try cutting off one more coil later or not, for now I am happy and plane is operative.