I have experimented with several different intial settings, mechanical curves and VA curves/starting points .
This engine does not like much more that mid 20s total at below 2000 rpm’s. I was getting some trailer hitching between 1500-2500 and breakup over 3k . I have softened the curve and disconnected the VA for the moment . Right now I am at 18* inititial @ 1000 rpm increasing to 22-24 by 1500 region and 32 total by 3k.