If you go for this, I would recommend you get to at least 90%/1%, with>600 GP.
Using that, I was able to get 60 HQ Rocks in 3 days (roughly 3-4 per node) with moderately casual play.
By using Dzemael Gratin, I am able to get to 635 GP. This allows me to do the following:
- Hit to expose the Astral Rock
- Use Sharp Vision
- Use Unearth II (Giving 31+ HQ chance)
- Hit the node 4 times (3*(5 GP per hit) will push you back up to 300 GP)[li]
[li]Use Solid Reason (if you got at least 3 successful hits... RNG can curse you...)
- Hit the node 1 more times
- Use Deep Vigor if it activated
- Hit the last time (Getting the guaranteed HQ if Deep Vigor is active)
Even with the risk of missing, the chance of HQ is so dramatically higher (and yes the RNG in this game is So odd).
I have ranged from only twice not getting anything, to getting as high as 5 HQ on a single node.
I consistently got 3-4 HQ every time using the above, with 95% after Solid Reason.