I think that this is still the MBD at play, as it does take at least a few weeks, if not over a month of having them under strong
UVB light for at least 13-14 hours a day for the MBD to start to reverse any of the physical damage it has already caused.
However, out of curiosity, have you been giving him a Reptile Grade Multivitamin since you got him? If so, which one and how many days a week is he getting it?
Bearded Dragons can also often suffer from a Vitamin B1 (Thiamine) Deficiency, and the symptoms of this deficiency mimic the symptoms of calcium deficiency and MBD almost exactly, with the only visible difference between the two sets of symptoms being that with the Vitamin B1 Deficiency they don't get the same "tremors" or "twitching" that they get with the calcium deficiency, because the calcium deficiency directly effects the nervous system and the nerve impulses, while the Vitamin B1 deficiency does not. I can't tell you how frustrating the Vitamin B1 Deficiency is for Dragon owners, because the symptoms are so similar that most vets and other experienced owners and breeders immediately assume it's a calcium deficiency/MBD and that's the only thing they treat for.
Your dragon definitely is suffering from a severe Calcium Deficiency and MBD, that's not a question due to the total lack of adequate
UVB light, so we know that. But that doesn't mean that he isn't also suffering from a Vitamin B1 Deficiency at the same time, which would be remedied by giving him a B1 supplement in addition to his regular Reptile Multivitamin, which he should be getting 3 days a week anyway. Unfortunately he's far too small for a blood test to determine this, but it's not going to hurt him to try upping his Vitamin B1, or even just upping his Reptile Multivitamin to 4-5 days a week, assuming that you've been using one that includes Vitamin B1 (Thiamine).
Something else I was thinking about with your dragon's situation and how this all started with his lights being so close and using a coil bulb...Do you think that there is a possibility that he may not be able to see, that he's actually blind and that's why he keeps falling and moving oddly, pulling away and such? It wouldn't be the first time I've seen this either, I have seen many Reptiles in general, not just Bearded Dragons but all kinds of lizards and frogs as well (pretty much any reptile or amphibian that is kept under lighting) at the Reptile Rescue I have worked at for a long time that have come in totally blind, and this is almost always due to the lighting they were kept under instead of an injury to their eyes or head. Some of the symptoms your dragon is displaying, as well as some of his behavior are possibly indicative of him not being able to see, along with the total insecurity and "skittishness" that comes along with losing sight. Just a thought...