I don't know what F3B is, but the guy I knows his stuff - he flies in IMAC contests I think. I'd have to double check that he said it - it might have been on RCG where I'd seen it mentioned recently.
FWIW to the OP, I ran an old used FP .60 with a 60c carb and Jett tuned muffler on a 12x6 APC and got 12,600 peak on 10% nitro 20% castor fuel. I'd be curious to see what an SF would do with a Jett muffler. If I can fab up an adapter, I'll tach my .60FSR on the Jett muffler and 7B carb. I ixnayed the pump and Perry carb.