Glad to see this discussion is still going strong!
I have some Uridine laying around and might try morning administration again. I have since cut out Strattera (and norepinephrine medication) completely and notice that my drive to do things is stronger than when on them. I consulted with my doc and he gave me one more month of strattera but told me to take it when needed (ie when I feel I am getting too impulsive) and if it's fine without, he will stop my script. I know I am repeating myself but yeah, impulsiveness is stronger and I am a lot more likely to forget things. Like, on Strattera I can manage my todolist app well and work through it during the day. Without Strattera I can focus on something that might not be important, and stick to it without ever thinking about the other things in my todolist. ADHD is a bitch man.
My anti-depression journey has now brought me to "Sulpiride", a "selective antagonist at dopamine D2 and D3 receptors". My doc said it's often used as a aytpical antidepressant. It has very little side-effect profile and doesn't seem to mess with the brain as much as other phenethylamine inhibitors. Just started taking it, so nothing to say on it yet.
Tianeptine is still nice to me, but there is definitely a rebound when I stop taking it. I will try Uridine (with the rest of Mr.Happy) instead and see what it does.
Concerta didn't kill drive to exercise at all, or effect the workout negatively. And physicality wasn't an issue either. It just made my mood and creativity kind of negative, and perhaps something akin to that wall you first described in the initial post. But there was no fog on Concerta and things got done and dealt with, just not as imaginatively, patiently and creatively as I would have wanted. "Taskmaster" is pretty accurate, just tack bitchy to that on my end. Thus far, the only thing that has negatively impacted exercise in my experience is Guanfacine, Propanalol, Clonidine, pretty much every SSRI I've tried, and now Selegiline, which I'm assuming was due to some hypotensive effect and/or serotonergic ones.
Have you tried reducing Concerta? I mentioned my 27mg / 18mg split in my previous posts and going down definitely helped with the taskmaster syndrome. When I want to chop through tasks fast, I take more.
The theory I am still with is that a dopamine / norepinephrine imbalance might be a big part of the problem. It's interesting that some people on norepinephrine medication become more creative, while some others have the same effect on dopamine inhibitors, but a negative result on norepinephrine, which matches with how ADHD profiles are different on different people.
It's of course also important to have realistic expectations and a good way to measure results. Taking medication and hoping that suddenly everything will become fine and we all turn into motivation-filled people is probably not gonna happen automagically.
My personal benchmark is with hobbies that I know I really want to do, but end up not doing because of this 'wall'. Things that make it easier for me to get by the wall is what I'm looking for.