I have the same engine and went through the same problems with a profile funfly. I found that the 12 1/4 X 3 3/4 prop was not enough prop for the engine. It flexed during transition and this caused the foaming. That prop is better for a strong 46 engine. I used a 13 X4 APC wide blade and solved the foaming problem. Regarding the engine quitting on spool up, I had to richen up my low end some, and this eliminated the deadsticks.