if you are still running (especially long distance) it could be detracting from your weight training. unless you do short sprints, that will actually help.
Also, if you have been doing squats as your only leg excercise since college, it would probably help to switch it up. For tall people it actually helps to try the dreaded leg press (i’m 6’3"), also hack squat, lunges, split squat. Also, Front squat sometimes helps keep a more upright back in tall people so it is a more quad dominant excercise.
Perhaps you should try high-rep leg press for a change. That’s what finally gave me a hint of a quad sweep on my naturally skinny legs. Don’t neglect the hamstrings.