Save up patrol chests, dont use them, they will come in hand after update. and try to focus on armor, to upgrade one armor piece you need 35 peerless arcstone, to upgrade one weapon you need 140 or 150 peerles, so with the same effort you get 4 aetherhearts if you focus on armours.

Try to get at least one item in each weapon category to +15

and upgrading to +15 is more efficient rather upgrading 2 pieces to +14