5 days is still on the low end of drying time. What is your RH in the drying environment? How dense is the bud? How clean would you say the air is? Are you using a fan to move air over the plant material or is it in still air?
When all else fails you can consider breaking the bud down into smaller portions to create more surface area for drying.
If you are as dilligent in checking like you seem, you shouldn't have mold issues. Do a smell and visual inspection whenever possible but I've never had mold issues and I've dried my weed in some pretty sketchy places.
The worst thing you could do is jar it/sweat it, you're just asking for mold problems there. Get it to a homogeneous state (ish) before locking it away.
Sounds like a first world problem to me hehe
Edit: just realized you have been drying for 12 days. That is quite long. Consider using a dessicant and/or breaking the bud down a little bit. Could also lay some flat and spread out on a cardboard box and have some air lightly moving over it.