Evis is normally better than Mordant Rime for non carns, as far as I could see.
Also remember that if you're not using /NIN or /DNC (i.e. single wield) you get a +6% crit rate boost which would only affect Evisceration and not the other WSs.
Mordant is the best choice for Carns of course, altough I feel if for some reason (amnesia, whatever) you end up at high TP values and do not need to refresh AM3, Rudra's Storm wins over Evis.
Depends on your attack vs target defense, but the threshold at which Rudra becomes better than Evis is around ~1700TP.
Higher if you're single-wielding of course (because of the crit bonus).
Still have to work a lot on my TP set, my current incomplete one is this one:
ItemSet 326089
Lots of pieces are there because it's stuff I already own, inventory saved +1!
Just found out about Lithelimb Hat, didn't even notice BRD can equip it.
Altough at that point I'll end up with an excess of Haste and no real option of taking haste out, aside from removing Angel Lyre I guess.
Which makes me wonder... don't you lose TP when you swap from Ammo to Instruments?
If you go Instruments > Ammo you should keep your TP, but when you go back Ammo > Instruments your TP should be reset, no? That's kinda inconvenient...