If you have enough stats to proc 100% HQ as node modifier, you can also get a substantial quality boost with the best buff skill. Maybe they even use the same formula, I'm not sure. That buff also costs 300 GP, so using it on a new node with 4+ attempts left will certainly be better than getting a single extra attempt out of the 100% HQ node.

Also, as noted, at a certain point HQ ceases to be meaningful. I'll rather use pick clean which gives me extra items but sets HQ chance to 0%, because I can craft 100% HQ items from all NQ materials.