hmmm, I wonder when you did the "power timing" relative to this recent "running only with choke" issue?
If you did the timing well before this recent episode it might be wise to leave it as is until you find out what is causing the engine to only like to run with a lot of choke.
Once that is resolved, then check the timing.
Otherwise you risk conflating the two issues.
I experienced similar symptoms - would only run with a lot of choke - and the problem for me was related to dirty fuel. Changed the filters and removed the tank and had it cleaned - problem solved.
Peter
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