the haste % isn't how much delay is cut off.. haste % in EQ shows how many more swings you do, 40% haste = swing 40% more often in a given time than without it hmm to use your math to find delay I guess you could take half of the haste %, then plug it in, will try to explain the logic behind that; 100% haste would be attacking TWICE as often, meaning you've cut the delay in half(by 50%..) so.. epic alone, 40% increase in attacks.. meaning 20% reduction in delay.. 20x16=320 / 100 = 3.2 16 - 3.2 = 12.8, round up to 13 dly
epic(40%) + cof(36%) = 76% haste 38% reduction off your delay.. 38x16=608 / 100 = 6.08 16 - 6.08 = 9.92 round up to 10 dly
as for delay going lower than 10.. trust me, it does, with chanter haste, I've logged my self attacking more than 4 times per second.. even quading twice within 1 second every once and a while