I was able to diagnose my problem. It was not keeping the chest up. The cue to use 'hip drahve' was overriding the need to keep the back angle set, so I was doing a fair impression of a good morning. Now I set my back on the decent and cue a lift of the bar rather than hips-it has the effect of cancelling out the good morning. As of today my squat is at 155lbs, so going in the right direction slowly.
Also, so far, bar a few twinges, my shoulder seems to be holding up-at least under squat, press and DL. Will see how it performs on bench Wednesday.
lying in bed hurt my shoulders. Some days after I press my shoulders hurt. Pull-ups hurt my shoulders. I usually have less shoulder pain after I bench press. At age 70, being alive hurts. Screw it. Keep lifting.
I've generally been very fortunate that I haven't had many of the joint aches and pains that many of my friends have on a consistent basis. One of them has developed brachial neuritis very recently during a lifting session and is in a lot of pain. However, my mum is in her 80s and is still working, looking after several young children and a guy in his mid 70s. She broke her foot and wrist just before Christmas and still got on a train and travelled up to us for Christmas. She is even considering barbell training - inspirational.