That's great! He sounds like he's on the road to recovery.
It does sound like MBD and you caught the disease in it's early stages and were able to bring him around. It does take a long time for chameleons to heal from that though, so be patient.
Personally I wouldn't use the cricket quencher for proper gutloading of bugs because it's filled with nasty chemicals. I use a more natural form of gutload, like carrots, collard greens, fish food, oatmeal, and nutritous "real" foods along those lines for my bugs. Click
here for a few really good gutload recipes.
I also don't find mealworms to be that nutritious either. They have a thick exoskeleton that sometimes is hard for chameleons to digest. I do use superworms as part of my feeding regime here but they aren't the primary food source. You can also gutload the worms with the above ideas as well! Do you have access to silkworms in your area? I think they are better for chameleons.
Click
here for a good caresheet on Veiled Chameleons.
Again it sounds like he's getting better. Keep up the good work and keep me posted on his progress.
Cheers!
Trace