With very well melded gear (except for the tools, which only have 6 GP on them) I’m at 1370G, 1313P, 751GP on my miner.

Once you have enough Gathering that you have 95% chance to gather level 70 things and 650 GP, OR at least 85% chance to gather level 70 things and 700 GP, then IMO the thing to meld for is Perception. This is to make gathering Collectibles easier, thanks to Impulsive Appraisal 2, making your Scrip gathering activities more effective. Something could be said for Bountiful Yield 2 and Gathering, but that would depend upon when you can hit +3 Yield with it.