Rollering is good: see if you can find something like a mini basket ball (and then a hockey ball!) for even better deep tissue pounding.
I noticed my hips got massively tight when starting out with deadlifts, simply because those muscles aren't generally used to being smacked around and so need a lot of TLC in the first few weeks.
Google Mobility WOD Hip Opener and see what comes up - some very good material there.
Weights are going up nicely, however! Keep going!
Deadlifting has a large mental component, and it could also be that you're not pulling optimally.
Rolling around on stuff is awesome. I twinged something very mildly (in my TFL) on friday, but somehow the tension was pulling my hip out of alignment. I tried to get out of my car and screamed like a girl 5 mins smashing TFL and glutes and everything relaxes back into place.
Good work - chasing me, pareticularly as I can't do anything for the next week!
Them's some nice gains!