RE: Carburator 2 stroke engine
I would add to Grant's words...
It seems you never attempted to get the idle down, from around 3,000 to ~2,000 RPM, which this engine is capable of sustaining...
The prop seems to be a rather large, 12.25x3.75W, which has enough rotational inertia to get idle down to 1,850...
And the mid-range does not seem to be getting too 'fat'...