What the heck; here's an update from me, too. I did a cycle with double KBs only for a while. I was working with double 20s. Since then, I've been working mainly with a single 20. The interesting thing is that I can get more tonnage in the same time with doubles than I can with singles. The longer rests between sets of double KBs seems to facilitate that for me.
Either way, after two or three months with the single, I tested the double 20s, and they felt stronger. A few days later, I did a Classic session with 20+20. I got 34 sets in 30:13. The last time I did that workout several months ago, I got 30 sets in 30:25. That's progress! Two days later, I did another doubles session with Traveling 2s, but a chronic issue from an old surgery started to rear its head again. I'll probably mainly do single-KB sessions and pepper in doubles sessions when I feel good. That balance seems to play well with my personal history.
The single KB IC, along with my other physical activity, has clearly improved my conditioning and strength. I think it'll be a longer haul before I'm back to my pre-injury 24kg training weight. That's okay, though. This has been a great opportunity to take my ego out of the equation and really dig in on technique. And, I'm making progress.
Onward and upward!