You cant overdry bud by the hang dry technique - you can (however) bring it to its and the 'Equilibrium Moisture Content' where it will stay for quite a while and is dependant on humidity levels.
Allow me to paste a wiki link to some 'Basic' science the rest of the world excluding Tad Douchfacehuss and many misguided mj growers and industry use...
https://en.m.wikipedia.org/wiki/Equilibrium_moisture_content
The questionis can you use what intelligence you have to see the answers are banging at your door waiting to be let in.
You either force dried your bud or you bud isnt that great to start with and magically wont turn into a great end product.
Funk do growers want... spoonfeeding cause thats where we go if you cant sort this out and come to a conclusion. Post your bud ill rate it out of ten