Just want to update this since I did some hardcore tinkering to see if hitting +2 for Pick Clean was possible on level 80 nodes yet.

SO, at the absolute max perception you can have right now at 2284, Pick Clean will hit +2 on everything up to level 79. Level 80 and 80* nodes still give +1. I suspect the new gathering gear we will get in 5.1 will allow us to hit +2 on the 80 and possibly 80* nodes, but you will need to be heavily, if not max melded for perception.

Also, it seems the thresholds for Pick Clean are basically the same as Bountiful Yield II. At the absolute max gathering you can have right now at 2303, Bountiful Yield II will hit +3 on everything up to level 79, just like Pick Clean.

(I blew up so much materia testing this out, but I just HAD to know. :P )