Hey TD, the PNF stretches against the wall that you mentioned plus sitting in a deep squat and using elbows against knees to PNF stretch in a similar way. I'm also doing various couch stretches (a la K Starrett) for quads, general hamstring stretches and some ankle mobility work (as I have a tight right ankle). Along with time, it's all helping to keep things progressing in the right direction. Once I start back squatting again, I'm going to really focus on form and consistency. I'm in no rush to pile on the load.
I've been more consistent with shoulder mobility work too. My shoulders are feeling pretty good for a change. I've been using a 41" x 1.5" rubber resistance band for dislocates instead of a rod and it's been great because I can put it in my suitcase when I'm away from base (which is just about every week now) so it's always handy. I can be sitting in a chair and reading some work-related blurb while my shoulders are getting a good stretching session. The rubber allows a bit of give through the sticking point but not that much. Hands can be rotated differently during the movement and gradually worked closer together as the old shoulders warm up. I find 15 rep sets with a couple of minutes in between sets works really well. The first set is always a little uncomfortable (even with thumbs looped into band for widest possible hand spacing) but by the second set things have warmed up and the discomfort vanishes. Then I work my hands in along the band until they end up about 26" apart. I hold the band with a double thickness in each hand rather than just a single thickness so that it doesn't flex too much.