I think 400 at 12% sounds fine. This is a highly individual thing...almost like 270 vs 45-70 for cartridge debates.
I'm shooting 435 at 11.5% I'd like to go higher of FOC but I'm already using 125gr heads and as short an arrow as possible. Gonna do some tests on waterproofing feather to try and bump FOC up.
400-ish at >11% is commonly deemed "good"
