I simple solution would be a as a reward to let us pick gear pieces or fully crafted. for example.
You finished here, bottom tier, you do not select any pieces all drops are random.
next tier, pick one set (10 pieces) of slavage for a gear piece,
next tier pick two (10 piece) sets
next tier pick two (10 piece) sets and one fully crafted
next tier pick one (10 piece) set and two fully crafted
highest tier pick 3 pieces fully crafted.
Cannot double up on fullly crafted pieces.