Ah ok, +3 is the most then? I think next time I will probably go for enough gather to 100% with the 15% bonus which should be easy to achieve, just enough perception for a chance of a HQ, and then spam GP to let me use kings yield/blessed harvest II and a bountiful harvest/yields IIs. For all I spent on this HQ gear and melding I've only really gotten an extra bountiful yield/harvest out of it, whereas I could've spent probably 8m less and gotten the same result with 1 less b yield/harvest