output caps at 114, any more then this is a waist. Perception caps around 100 at 10% and when master of XYZ ability procs it allows you to surpass that cap which is why you want as much perception as you can. I get a general feeling of 30% HQ rate when master of XYZ ability procs with 160'ish perception. I try to wear enough gathering so that I can 1 shot what i'm going after within reason, depends on the target item. I would venture to say the +10 HQ stat is equivalent to +1% HQ rate. This is just a guess based on the 10enmity => 1% enmity gain stat, that and its easy to code/balance.