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crackedback said

Are you sure it stopped advancing at whatever RPM point you stopped?

This is usually a HUGE error when tuning. Run the RPM up until it stops advancing, not some number picked from a recommendation or guess. It may have more advance in it than you are seeing.

Not enough initial timing is the first thing I see and would attack.

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Hi Rob. Yes, I'm quite confident it stopped advancing. I can't tell you the exact RPM it stopped advancing off the top of my head, but I did roll the throttle up from 2600 to 3000 - 3200 a few times and timing was stable and not climbing within that range. I can watch it advance as I roll up the throttle, then it goes stable and stays there. Next time I have the light on it, I will find out what RPM it stops advancing at.