Easy fix: make it so crafters can craft best-in-slot set bonus armorings, along with BIS hilts/barrels/armorings for mainhand/offhand.

It should still have that "endgame grind" feel to it like command crates do. So make them require multiple ops/hm fps/pvp crafting material rewards (more incentive to group up and play at endgame), and make the item crafting take like 24hours with a lower chance at getting a re-engineer schematic. If you wanted to take it a step further, make it so that they require crafting materials that can't just be acquired through crew skill missions, but actually require you to go out in the world and farm (or buy on GTN).

This would make endgame crafting more relevant, improve the economy, and fix the RNG problem with command crates in one easy swoop. I would still get my endgame gear primarily from command crates...but this way if I open 100 crates and never get s single chest piece, I can still get a BIS set through crafting and ripping mods/enchancements.