I have not tried nor am I far enough in the game to do it, but if an item drops with 2 or more LP, can you take an item with 3 affixes and erase off all but the t6 or 7 affix combine it with your Legendary and have just one less LP, or is it a case of one slam, and if you don’t use all the lp they are gone?
It has to have 4 affixes, no way around it.
Recommend pressing G in the game and reading on Legendary, it explains it very well.