Hi - You should be at 10 degress BTDC at idle - maybe a little less if you have your engine breathing better.
Do you have a 123 Tune, or the regular one? It sounds like you have set the static timing yourself, then the 123 is ahead of the game until the revs build-up and the advance stops advancing? I believe the 123 reaches max advance of 34 degrees at 2000 rpm. Is the engine running hot? Does that sound right? I'll be surprised if dropping the static advance doesn't fix the problem.
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