Sorry to hear that you're having trouble with your boa, OP.
Isolate your boa from any other reptiles you have immediately. Your boa is throwing some red flags for something called IBD (Inclusion Body Disease), which is unfortunately circulating within the captive boa population (particularly within morph boas/common BIs). Otherwise unexplained weight loss and a loss of coordination are common symptoms. Call your reptile vet, see if you can get a quick opinion over the phone, and consider getting your boa in to get tested for IBD through the University of Florida. It's not uncommon for baby boas to be a bit uncoordinated and wobble a little when they make a Big Stretch, but this sounds like it could be something more.
The only other thing I could think of that would cause such weight loss is a parasite infection. A fecal test could establish if parasites are at fault quickly. Being weak from weight loss could explain your boa's loss of coordination and weakness.
Your enclosure is a bit on the large size for a boa that young and your hot spot could be about two degrees cooler, but it sounds like your boa is otherwise okay with that setup if they're eating regularly and out and about.
Good luck!
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