I was and am still not at level 80 so upgrades to the uniques of Wedge and Biggs are not available to me. And I don't have enough omega mats for another upgrade and probably won't have enough until I get to 80.
But just for the benefit of others facing the same situation, I'm probably going the following way w/r/t omegas when I get to 80:
--Biggs special (CD -1) (done)--
1. Wedge unique (extra speed so I'm (hopefully!) first to get off Biggs's OHKO)
2. Wedge basic (+15% damage to improve chances that Biggs's special is in fact a OHKO)
3. Lando special (+25% damage on next use)
4. JKA special (+15% damage)--if he's arena ready
5. Biggs basic (+15% damage)
6. JKA basic (improved chance to debuff)
Of course, it would be reasonable to go another way (e.g., I could be convinced to switch 2 and 3). But that's my preliminary thinking. The rest of the abilities for this group (including, St Han) seem low priority. I'd rather omega my Rancor raid team first.