Sorry, but I call shenanigans on you being able to pull "1400 on long boss fights" with stats like that. Just checking my armory, with only MOTW up I've got about 1570ap, 33.9% crit, 123 hit, 7 expertise, 21 haste, and 413 ArP. Even on a fight like Teron where you have massive heroism uptime, full drums rotation, and higher haste pot uptime, I'll pull around 1500-1600 according to WWS. But I digress...
That aside, you should pull as much as your guild is willing to take you with. If they say you need to get xxxx dps or you dont come, well, then you need to kindly inform them that melee dps is heavily dependent on group/raid makeup, so you will probably see massive variations from week to week depending on group makeup.