total timing question

I ran 25 all in with the Modman....I dynoed it up to 28 all in and it made 1rwhp more

But due to rubbish cylinder pressure..I was able to run 21 initial! - so my experiences are not par for the course.

With the Eddy dual quad Ill be starting at 15 initial to 23 total - and listening very very carefully!.

This is not including MAP advance at cruise