Hi Dave,n
Good to hear from you -- I am envious of your ability to shoot on your patio at this time of year -- we already have so much snow that there is no room on the side of the road to walk my dog. In fact, pedestrians are starting to get run over. So, I shoot a couple of times a week indoors if I am lucky.
I am still focusing on back tension -- I have a drill now that I can do anywhere -- at work, at my desk -- pull the ribs just over the gut in toward your spine -- pull your shoulder blades down until they won't go any further -- then pull the lower tips of the shoulder blades together. I used to just try to do the third step, and somethings it 'was there' and sometimes it wasn't -- once I added the first two, I can do the third step almost every time.
Getting better every day
Have a Merry Christmas!