Do not forget secondary stats such as MND(for miner). Multiple people have tested and confirmed stacking these stats also increase HQ rate. Then again most of this is personal testing and speculation. Personally i believe getting output to 115.. then filling it in with a good mixture of the other stats is the way to go. Still not sure gathering is really worth it when your shooting for HQ. Even if its taking less swings to get an ore.. thats not really increasing your HQ rate per hour