Yep, I agree RCIGN. That's the way it should work, however the timing is artificially (not mechanically but electronically) retarded by the Ignition electronics.

Again, I'm just speculating here, but what if the timing, or the transient response at the low end isn't up to par?

I'm just postulating (I like that woyd) here, for even though I own two of these engines, which BTW, you machined two very beautiful prop extensions, I've yet to experience these problems, and since they're going into a twin, I pray I don't!