Yes the OS A3 is slightly hotter and my Tower 46 won't run good without it. Mine also does not like an 11 inch prop and runs much better and more consistent with a 10X6. With a 10X6, an A3 plug, and 15% Omega fuel it transitions very good and has never died. With an 11X6 and a Tower plug it would die in flight fairly often. I bought the engine used (less than 10 flights) and the reason he sold it was because of the quitting in flight. The 11X6 and Tower plug came with it and after flying it a few times I started changing things until I wound up at the configuration listed above and now feel it's a decent engine but I do have others in this size that are better. I hope you get yours figured out.

Edited for punctuation.