Most loot armour worth using cannot be imbued anymore anyway, as its not exceptional its max weight is lower than an excep crafted bit so even if it will allow another imbuing pass it you wont be able to add much, if its got good properties but fairly low resists you can often enhance it will a special material to add resists, even then you need that forged metal tool from the origin store.
Oddly some of this new loot claims to be enhanced with special material already, and you only find this out when you actually make the enhancement attempt.
Jewellery is where its at when it comes to imbuing loot items, and often its lower end monsters that deliver a nice ring or bracelet with only a couple of properties so you have 3 passes left, particularly non imbueable properties like SSI, stam, MR etc, even ones with inbueable things like FC are worth grabbing as it saves on special materials/essences, the imbue weight of jewellery is the same whether its exceptional or not.