That's some weird ass timing. It should be a smooth increment up until redline. 10.5 @ 6500 RPM is pretty normal for now. Where it starts at 3.5 @ 2500 RPM 2.13 load you should probably do a +1 increment at (ie. 4.5, 5.5, etc.) until you hit 11.5 degrees @ 6500 RPM. 12.1 degrees is a ton of...