you got a lot of numbers. I can get a 130 degree basking spot with a 90 wt flood light. Mega what ever, just teasing you cuz I owe you
I would agree the basking temp should come up about 15-20 degrees
Also, be wary of the temp gum on their skin. What needs to be measured is their core temp not surface temp. For example C lewisi tend to keep their core temp, what the lizard think is optimal at 105. Yes there was a study done in GC. If your cyclura is spending the whole day under the lamp its not warm enough.

jf