Heh, it's funny that since you did evidently decide to take a break this thread reads kinda like so many random reddit threads of someone in the throes of drug induced mania thinking they've found the solution to all life's problems.

I guess it is pretty obvious what flavour of ADHD you have. I mean that kindly by the way, you're not incoherent or anything, and I appreciate the detail, most people don't bother keeping everyone updated on the aftermath of this kinda stuff. And good for you for taking a break.
That said, without meaning to shit on your bonfire I am now skeptical that the minor differences in formulation of magnesium and the mix of other vitamins you're taking, that you're attributing the fluctuations in your mood to, are actually having the impact you think they are. I think probably your fluctuations in mood and whatever other elements of your state of mind are just a pretty typical result of quitting a stimulant habit (even temporarily) as your brain wobbles (metaphorically speaking) between highs and lows in an effort to readjust to the absence of exogenous NT-releasers.
Not that these things are having no impact at all but supplements don't usually work like drugs do, where you can genuinely experience a change in mindstate within such a short time. Still, there's value in the process of experimentation since even if there is an element of placebogenesis or nocebogenesis and seeing a causal relation where there might not be one, it still scratches that itch of feeling like you need to take SOMETHING, and there's value in these kind of reports because obviously, there are going to be some patterns that will never be picked up on if no one bothers to write these kind of reports, so please do keep us updated.
Maybe I am just a bit jaded, I used to be very scientific about supplementation and hyper-aware of minor changes in mindstate and variations in endurance and suchlike, as you appear to be now, which in retrospect may or may not always have been attributable to whatever vitamin stack I was taking, rather than just to natural human fluctuations in mood from day to day... but at some point, I dunno, maybe I actually just took too many drugs for too long and burnt out my sensitivity to the subtleties of these things.
I don't know offhand the difference in neurological impact of all the different forms of magnesium you mentioned but your observation about glycine is not too far off. Glycine primarily stimulates serotonin release, which although there are many reports of people enjoying this effect, is actually kinda a mixed and variable bag of possible subjective impacts, some of which could easily be unpleasant. Higher doses I believe actually stimulate dopamine release too, but not to the same extent as serotonin, and there probably isn't enough glycine in magnesium glycinate for this effect to be relevant, and even if it is the serotoninergic effect will still overwhelm the comparatively minor impact on dopamine,
especially so if you're coming off a long stretch of suppressing your natural dopamine production. So it certainly does make sense pharmacologically that you'd find magnesium glycinate to be depression-inducing. Maybe that fact kinda lends credence to the idea that I am indeed just jaded.
Gods, I need to take my own tolerance break soon and I'm not looking forward to it.