Lucky and splinters are the females...right? And you have the four housed in separate cages?
Most of the husbandry you listed is good IMHO.
Does the light from your UVB bulbs pass through glass or plastic?
Re supplementation...I've never used T-rex cb chameleon or reptivite or reptical....so I don't know from experience if they are good or not. I do know that reptivite has vitamin A from preformed sources and that preformed sources can build up in the system. What does t-rex have in it in the way of phosphorous, calcium, D3 and vitamin A? Is the vitamin A preformed or beta carotene? I also can't find a breakdown for reptical regarding those nutrients.
You didn't mention gutloading your insects either...do you? If so...with what?
I dust with rep-cal's phosphorous-free calcium at most feedings. Insects have a poor cal./phos. ratio and this helps to compensate with it. I also dust twice a month with their vitamin product...preformed vitamin A can build up in the system but beta carotene can't. I dust twice a month lightly with rep-cal calcium/D3. D3 from supplements can build up in the system so you need to be careful...and if your chameleon gets direct sunlight it should be able to produce enough D3 from that. I use repti-sun 5.0's as the UVB source.
I'm not saying that my way is the only way or the right way...I'm just saying that I have good success doing it this way...and by remaining consistant with the brands, I have attained a balance. If I keep switching brands/methods, then its hard to keep everything in balance.
For good bone health, its important to have a UVB source, appropriate temperatures, and a balance of calcium, phosphorous, vitamin A and D. These things also affect other areas of the chameleon's health too of course.