I am gut loading my feeders with a variety of fruits, vegetables and whole grain bread.
bread isn't a great choice. Can you be more specific about the fruits and veg?
also do you use a multi-vitamin supplement (other than Calcium with D3)
The waterfall gets cleaned very regularly and he has come to know it very well... do you still suggest removing it?
Do you clean it daily? Do you clean the insides (they usually have tubes inside that are difficult to remove and clean)? Do you clean it with peroxide or similar (not just soap/water/wipe)?
If you answer no to any of these, yes I would remove it and provide water in a more natural and clean way, such as with a dripper (also cleaned regularly) and frequent long mistings.
I find drippers (which are nearly free to make) are the best for watering chams.
While it does seem like a lot of lights, it is the amount needed to get the right temps. I am using a hygrometer to measure both temp and humidity. I was finding the temp was dropping too low at night ( around or below 70), hence the night glow. it doesnt effect his sleeping at all.
gosh You must have a terribly cold home to need two 100watt bulbs. That or maybe your temp guage isn't working well? Do you have a second one you could double check with?
Below 70 at night is fine. below 60 and I might consider warming the room or a ceramic heat bulb (which emits no light).
I believe it is either a stress induced problem or allergies.
that seems highly unlikely to me. I'd be more inclined to go with a parasite, an infection or a deficiency over cricket allergy.
But you can try to rule it in or out. Are you hand feeding? bowl/cup feeding? Have you ruled out contamination from soap, bacteria etc? Keep a log - does it only happen with dusted crickets or also undusted crickets? Does it happen with roaches? butterworms? stick insects? etc. Does it happen if the prey is in the cage or only if he eats the prey? Time how long between his eating and the eye issue. log exactly when the eye goop occurs, and all other factors (temp, food, etc) over a few weeks. Having some hard data might help? If you find that crickets are the culprit, there are many other prey choices that you can use.
Here is a list of commonly offered feeder prey:
https://www.chameleonforums.com/blogs/sandrachameleon/74-feeders.html
Toronto has LOTS of options. You live in the best place in Canada to get choices

Almost all the bugs we get in BC are shipped here from Ont.
But if you cant find anything local, try online:
https://www.chameleonforums.com/blogs/sandrachameleon/171-where-buy-feeders-online.html
Do you think the reason he isn't eating is because he cannot see the feeders? Or is he focusing fine, then shooting and missing?