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Clois,
Your approach to your problem is correct however, there is one thing I would have done differently. Trial-by-error diagnostics should involve making only ONE change followed by testing. This will give you an indication if you are on the right course. When you make two or more tweaks it's sometimes hard to determine which one made the difference. I would have only modified the accel pump linkage and tested that. I am pretty sure your timing advance has nothing to do with the flat spot.
When you think about it, the advance takes place while the engine is spooling up, not before.
Good Luck
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