In my experience over gathering sessions, 500 NQ means 100 HQ. That's from hitting the INS key 600 times, no GP use, just 100% Gather rate, 15% HQ on standard nodes.
What I have noticed is that even if I force HQ where GP allows, it will work out roughly the same. If you have 700GP you can force most nodes before ShB to 100% HQ and get all 4 hits to 4X gather for 16 HQ. All that does though is bring down the 'random' HQ amounts, or so I find. In the end I still end up with an average of 100 HQ to 500 NQ.
I'm at the point and assume most others are as well, Actual gathering is done with collectors glove on and farming is done by retainers so that's all retrospect.