Since my Roth is not being overly happy, I pulled it out of its pot today to check what was happening with its almost non-existing root system (to see if I had managed to rot the few roots it had or not). There was no decline as far as I could tell but also no improvement or sign of growth. Instead of putting it back into its slightly too big a pot, I put it in a smaller one that fit the roots better, thus it went from a 11cm or 4.5" pot to an 8cm or 3.5" pot and it looks rather silly now.
Its colleague, the Michael Koopowitz underwent the same treatment, mostly because I wanted to see what was going on with its roots and they were doing splendidly, not only has its root nubs grown a lot, but its old roots are getting some new root nubs on them as well.
Since it had an even smaller root system than the Roth, it also moved into a smaller sized pot (the same size as Mr Roth) and it looks even more silly due to being a much larger plant in general.
I really hope my roth will come around and that moving into a smaller pot might help it doing so.
Here's a picture of my silly looking pair (MK's on the left and Mr roth's on the right):