Opps - I replied earlier before seeing this part of your post. I must have missed where you said you had a laser thermometer. Those are the best way to go but remember you need to measure three spots and all three are important. The baskingspot (115-120F), main floor (100F), and far side hiding spot (85F inside the cave).
It would be a good idea to check the overall cage temps in the early morning before your lights come on as mesh doesn't retain any heat. Make sure you are staying above around 70F as your nightly low. Most Uros are poor eaters if the night temps drop too much into the 60's.
I must have missed a couple things - sorry I didn't read all the posts connected to this thread (I was just trying to post a few quick answers today and get back to work!). Yes insects tend to cause more problems than they are worth. I know many posted caresheets and books advocate their use but Uros really don't need them. Think of them like candy. You're kids may love them but do you really want this to be a significant part of their diet? We only recommend them as training aids for shy Uro's. Otherwise they can get all their protein needs from a good selection of greens etc.
Lastly in responce to the questions about WC-CB, we (Deer Fern Farms) do sell both WC and captive bred. I wish we produced enough to sell only CB but for may species it's not an option. It depends on the species as too what percentage is which. Overall, we sell about 75%/25% CB to WC. By species, Moroccans are all CB, Algerians are all WC (no CB's exist as of yet). Saharans have been 50/50 but we're phasing out all WC Saharans as they are too problematic. This year will be 90/10. Ornates are in theory all CB but I feel certain some the adults entering the country are WC or ranched and we list them accordingly. Almost all our Mali's are CB and we have also been phasing out most WC Mali's - we still cherry pick a few each importation for those who want breeding stock but we generally don't offer any for pet buyers any more. It's not that they don't make good pets, but it hurts the captive breeders to have to compete with wild collected animals and we really want to see more people breed these. Egyptians are esentailly all CBs or ranched as are Indians (those are actually probably all ranched and rarely available to the US market).
Most the other species are hard to get as CB or WC. Sudanese are 50/50, Benti of late have all been longterm captive or CB, Somali's are essentially only available as WC, pure Ebonys are all WC to date, pure Bandeds are very rare as CB -we just sell longterm captives at this point. Debb has some probable Banded x Ebonys but other than that those two species are just not being produced as of yet. For the most part, enough true CBs are just not being produced to meet the demand for Uro lovers. If you've got a pair of Uros anyway and would like to see fewer WC - why not consider going the extra step and trying to breed yours?? It's not easy but those babies are a kick in the pants!!
FWIW,
Doug