I'm not saying with certainty that you have budrot but plants just don't start smelling nasty without reason.
If you have budrot you should bin those plants, at least the old one. They are low THC, as you said, so nothing to recoup there and the CBD yield will be lousy. Just buy a bottle of CBD oil and you won't have to mess with drying, curing and consuming an inferior product. Set your standards high from the start, learn from your mistakes and do better in the future. It's only 2 plants anyway...
You shouldn't dry weed in the same tent you're growing it in. Prepare better for all phases of your grow next time and pay more attention to overfeeding, PH problems, humidity, temps and mould.
Again, not saying that you have budrot but you really need to check for it.