Well then in my opinion, your numbers are pretty reasonable then. The low compression is making the motor soft and those are some decent times considering. I also think that 13.0 A/F ratio sounds pretty lean, but without seeing a graph it's hard to see the big picture.
Don't trust the stock tach. I can watch both my stock tach and my Autometer 5" tach and in the upper RPM's (over 4500), and my stock tach is about 300-350 RPM higher than what the Autometer shows. I know the Autometer is more accurate because my rev limiter is set at exactly 6400 and if I ever bump the limter, I can hit recall on my Autometer and it will show exactly 6400 RPM. My stock tach will show close to 6750 when I bump the limiter.
Just keep practicing - you know what they say.