The hanging until the branch can snap method works. you just have to jar them up for a while and allow the moisture to evenly distribute throughout the bud.
Any method can lead to over drying wether its a bag or hanging. the trick is practice.

next time begin jaring your buds a little earlier. the good news is once you get the hang of it you will never forget how to do it.

many factors play into drying. not all the bud is going to dry at the same time. smaller ones first, larger ones later. temp and humidity are a big part of it.
If you have huge buds, keep the humidity a little lower.
cooler temps are best for drying. like 67-72.
hope this helps...