Having recently returned to HZ I'm pleased to see some new end game stuff added over the past year ... Valkor, Reklar, SoG, etc.
After killing them a few times and talking to some older players I've come up with this suggestion:
Rather than having the boss drop the part/weapon/repair form make it a quest that require you to kill the boss 8 times (can be rasied or lowered) and then return to a npc who then gives you a random part or perhaps a "searching though X's remains u find a ***" msg and then a drop in your inv if possible.
This way everyone will get something from a kill rather than 1 lucky person and depending on how many kills will be required it will still be rare items.
Why this npc have the parts and why (s)he wants them dead or why they don't have drops on them each time I can't say ... never been good at making stories