/Nin does seem really cool on a Scrapper, I’ve teamed with a couple and they seemed really tough. Nice to know about the T9 as well!
As for /Bio, are there any attack sets that you feel pair particularly well with it? Battle Axe seems like one, but any others? I remember hearing Kat/Bio was pretty monstrous.
As a suggestion to OP, I have quite loved StJ/Rad Armor and Psi Melee/Shield.
The StJ/Rad just seems to combo together really well, nice procable AOE’s and great ST damage.
Psi/Shield is just…. Well the rule of cool. Looks awesome. Shield Charge + Mass Levitate is good times.