How to mod nest?

Protection is a waste on her, once it's gone you don't have any more benefit.
Health is much better as her bonus protection is based on it and she's more durable.
Tenacity isn't needed that much, she will live through her bonus protection. Only thing is fighting Jedi Knight Revan with his Health decrease ability, Tenacity can counter that.
Speed is a good addition if you want her to act and kill someone and she's pretty good at doing so, so yes.
I've never seen a Nest modded with any others than these so i think that's basically it.

Tenacity health and protection. She doesn’t really need too high speed since she counter attacks a bunch, tenacity should help her resist Daze.

Zeta(L) Qi’ra, ZNest, ZVandor Chewie if it’s the 3v3 GA

5v5 is more flexible

Vs Revan I have all tenacity sets with all health primaries (where possible) and health/tenacity secondaries. No extra speed.

Vs others, speed then health then offense/CD.

Tenacity is a big one so she doesn't get dazed or stunned. I have her at 40k health, 40k protection and 113% tenacity. I can auto ewoks by herself and with qira lead with just nest, I can auto any bastila team as well. (Very handy in GA)