Gday Drac,

I have never used the Bubbleless tank so I can't really comment on that,
I do use a normal F3A tank with the YS foam clunk and don't have any issues .

From my experience with these engines the biggest problem is keeping the fuel temperature below the boiling point of the methanol with is quite low.
I f you can manage this you will prevent the fuel from cavitating inside the pump.

It is very important to have good airflow around the engine .......this is something that model designers don't address very well.
I was very impressed to see mr Najary in his build of the Fantasista design a cooling duct for the ESC.

regards