I dont know if this is being *low* hanger, but my balls hang 6" and they are about average size... even though they hang if it wasnt for a regular sized flacid (6" as well) they'd fit woituh much problems on regular underwear i suspect... so the size of them has to be an issue...
Definitely just hanging can be a tad unconfortable i guess bigger balls do swing more and get more in the way