How often do you dust his feeders with calcium?
How often with calcium with D3?
How often with the multivitamin?
Are the vitamins expired?
They do lose strength over time and that's the reason for the printed expiration date on the bottle.
How old is the UVB bulb?
Is the basking light near the UVB bulb?
His tongue issues, if they came on gradually--as a shorter and shorter shooting distance--could very well be caused by nutritional deficiencies.
One of our forum's longtime chamkeepers, Sandrachameleon wrote an excellent blog about the causes of tongue problems , found here
https://www.chameleonforums.com/blogs/sandrachameleon/232-tongue-troubles.html
The orange/red in his urate indicate that he needs more water.
It can be caused by too low humidity, too little water intake, too high temps or even parasites or internal bleeding.
Dehydration will cause incoordination and tongue problems, too.
Hopefully that red isn't actually some blood in his urine.
A fecal test would help rule out parasites which rob your cham of nutrients, can dehydrate a cham and which can actually do damage to the organs they inhabit--which can show a sign such as blood in the urine.
I do see 2 issues and not knowing the answers to the questions above, there may be more than 2.
The first thing is that he is likely getting too much D3 for a Jackson's, which are especially sensitive to any oversupplementing.
If you switch to Reptivite
without D3, that would be better for him.
If all he ever is fed is crickets, he would probably go nuts for some tasty , calcium rich Phoenixworms.
They are very wiggly and the motion is quite alluring to chams. They are also slow enough to be caught fairly easily and an added benefit is that if his calcium level is low, the Phoenixworms can help to correct that.
I order mine from here where they raise them
http://www.phoenixworm.com/servlet/StoreFront
If you could get hold of some safe land snails--ones known to not have any pesticides and preferably captive raised--you would be amazed at how wild Jackson's are about snails.
They eat snails shell and all.
Some have said that land snails don't contain parasites that could afflict your cham but raising your own is the safest.
Water snails on the other hand are known to harbor parasites that could infect your cham--so avoid all water snails.
The other problem is that the commercial gutload you mention really doesn't add much nutritionwise, so your feeders aren't nearly as nutritious as they could be.
A good, inexpensive homemade gutload where you add raw scraps of fruits and veggies that your family eats would be a big improvement.
More details are here
https://www.chameleonforums.com/care/food/
Since you're in PA it may still be a good time to let him enjoy a little natural sunlight basking time. Days in the 70s are perfect Jackson's weather.
A cage will keep predators from snatching him and a plant for cover and a vine for standing on, plus spraying him and/or a dripper to keep him hydrated will be needed, too.
The benefit of natural sunlight is that his body will produce its own safer-than- supplements form of D3, in case for some reason he is actually low in it.
Sunning is truly most Jackson's favorite activity and outdoor time can sometimes perk up a lethargic Jackson's.
I hope this helps you to get your sweet Jackson's feeling better.
