Results for higher Perception numbers:

Gath 3097 Perc 3692
50 -> 40 Lv 86 -- 50 Carrots of Happiness, 40 Ironwood Logs
40 -> 30 Lv 89 -- 40 Elder Nutmeg Seeds, 30 Integral Logs

Gath 3097 Perc 3717
50 -> 40 Lv 86 -- 50 Carrots of Happiness, 40 Ironwood Logs
40 -> 30 Lv 90 -- 40 AR-Caean Cotton Boll, 30 Alien Onions

Gath 3097 Perc 3734
Same as 3717

The 3717 number my wife achieved with just a few single overmelds of her Pactmaker MH/OH/left-hand side and L89 right-hand side. I think if I was starting from scratch, I'd go straight to her gear setup instead of using the L89 MH/OH/left-hand -- it might save money by requiring less overmelds.