I still had the power rings from the hard light dlc to transform any character's power to light. I used it to go from sorcery to light. I have noticed that most random drops still favor the healing/dps specialties. This has also crossed into an issue with the vault. The noticed I only get Biotech, demonic, and sharpshooter styles and one mark of triumph. I have kept record this last month and running 2-3 vaults a week that is all I have received everytime. Is this a bug because I used the hard light ring, or is it just my imagination? Don't get me wrong I do not what to go back to sorcery, because I will just use the T-armors. It just can be frustrating.
The vault has a huge pool of drops if pulls from. It took me almost a year to get my last sharpshooter piece. So your powerset has nothing to do with that, nor does your armor, its random. As for loot drops...ehhh i'm a healer and i always get tank and troller pieces...soo its subjective.