Probably the most important breakpoint (Aside from the minimums needed to gather the new mats at all) is 1550 perception to be able to get HQ on the new 4.4 materials. 1650 gathering is also nice (Though rather meld intensive) as it'll let you get 95% success rate on everything so you can boost it up to 100%.

800 GP with food can also make gathering aethersands a fair bit more efficient as it'll let you squeeze in an extra gathering attempt (Shoot for 780 GP without food so you can bump it up to 800 with some dirt cheap antelope stew from a vendor).