new to uros

I rescued a uro in December. He was in too small a cage, eating the wrong greens, did not have enough heat, and was filthy. Thanks to Deer Fern Farms, we have corrected those problems, but I have a few questions and concerns.
1st) He weighed 286 gr. when we got him and I was told he was obese. He is now down to 256 gr. and is 12 1/2" nose to tail. I do not know his age. What is an "average" weight for a uro this size?
2nd) He was extremely lethargic when we got him. He went thru a period of increased activity, but has now decreased his activity level again. He is eating very well, greens dusted with miner-all or uro dust, and bird seed daily; pooping almost daily. Any ideas?

We don't have an experienced reptile/herp vet in the area, so I am looking for one, probably Round Rock/Austin area will be the closest, so he has not had a fecal or any other testing.

Thanks for everyone's help!
Angel