Hey Mick,
As a fellow member of the over 60 club, I enjoyed reading your post. I started out in DdRT, and I still use it, however my main ride these days is the HH, and climbing with it has been a revelation! Like you, I mostly climb alone, in the woods nearby my house. You can't beat SRT for those long ascents. Most of my first pitches are at least 70', and the pine I climbed recently was 90' to my first pitch. Climbing in the woods has its own set of challenges. There was a very small window in the canopy, and after a few tries I was able to hit my target with the BigShot. I set a basal anchor and was able to get up above the canopy. It was like being in another world! I spent some time enjoying the view, and moving on up in the tree. Now that I've isolated that branch, I'll be able to set up a canopy anchor on my next go-round. One of the things I like about DdRT is being able to take my rope with me if I want to, and with a canopy anchor that becomes possible in SRT. Also, with that setup, it's very easy to switch between SRT and DdRT. I still have a lot to learn, especially moving about SRT in broadleaf trees. But that's what I love about climbing trees, endless possibilities for adventure and learning new things.