at 41 degrees and 140 you are getting more speed for every unit of current. this is efficiency. the next couple timings have the same plateau pushed slightly right. i see 2 plateaus in some curves which usually means bad data or a bad rotor.

the plateau gets harder to see as timing goes up but its there. Its easier to see at lower timings because your peak efficiency will be something like 70% and as the timing goes up and pushes rpms to the right the peak efficiency will be for example 50% or 40%. Since very early in the rpm of a high timing curve it starts at 20-30% its hard to see the peak because its getting closer to the average efficiency.

Look at the plateaus in lower rpms. This is efficiency. Look at the curve of the next higher timing and you will see the same plateau but smaller. Then the next and it will be smaller. This is what happens to peak power and peak efficiency as the timing goes up. Less peak more average. But overall less under the curve because the trade for moving the plateau right is taking allot more of the peak than it gives back.

divide rpms by current. Its the slope. The lower the slope the more efficiency. The big plateau at 40 ish degrees will give you the least to the right and the most to the left. Add timing until you are taking more away from the left than you are gaining to the right and then go back down one timing level. That’s the sweet spot.

I can see 2 knees in every curve. The one to the right seems to be moving in the right direction on most of the curves. But the one on the left is moving away from the one on the right. Somethings wrong. But if you think about it....a dead spot in power would get worse as the timing gets better for high rpm because the magnetic field is not inducing motion very well and you make it worse by making the timing wrong for low rpm. It just gets more wrong as the timing goes up. If you bad spot moves progressively left it will minimize the bump to the right moving right as the timing goes up. That’s my guess as to why the bump to the right moves right for awhile at a fairly constant rate and then stops moving at that rate.

46 looks the best because timings higher than this diverge rapidly at a different slope. Allot more current for not allot of rpm. Look at the pattern of plateaus but start by calibrating your eyes at the low timing and watch them spread as the timing goes up.