They get plenty of UV in the shade. More than any light could produce.
Hold his feeders up close to him and when he starts to stick his tongue out stick the feeder on his tongue.
I don't know what causes it but my guess would be the eggs were not fertile. I've had it happen before where most of the clutch only had the yoke and a few had babies.
You need to check out member sandrachameleon's blogs. I gut load with a variety of greens such as collards, mustard, turnip and kale. I also use carrots, oranges and sometimes apple.