Air fuel ratio nitrous

so what kind of air fuel ratio do your guys big blocks like with nitrous. I’ve been reading some say low 11s. Last time on dyno it was tuned 12.5 with 150 nx plate. Got just over 100 whp on 150 jets.. I’m going to go try to tune it best I can before I go back to dyno. I just put on a brawler 950. Different intake and some other things. It had Holley 750 street hp last time on dyno. What do you guys consider too rich? Thanks