Good on you for helping this guy out. I would try to get his basking spot temperature up into the mid 90s. Also, what humidity is the enclosure? Accurite makes a good thermometer/hygrometer for this purpose.

Please do not feed torts any animal protein. They get all nutrition from a fully herbivore diet. I would concentrate on feeding spring mix, kale, turnip greens, collard greens, mustard greens, dandelion weeds, mazuri (or any high quality tort food). If he will take it you can try offering various grasses, but if he is eating the mazuri that component is taken care of. Tomatoes and other veggies and fruits should be fed only sparingly.

What type of repti-sun bulb do you have? These bulbs lose efficacy after about 6 months. I recommend a t5 HO 10.0 bulb.