I've just taken from a couple off the internet really for strengthening glutes and hip abductors in general.
Side leg lifts
Clams
Squats and Single Leg Squats
Hip Raises, Single Leg Hip Raises
Glute Kick
Lunge
I'm also using tennis ball work my TFL as I suspect it could be tight, I also feel sensation in a similar area to my knee issue when I roll the hip in this area.