Like Greg said, one should be able to create a comfortable shelf that the bar can rest on at the T-3 T-4 level. If you are hanging on with just the arms that means the shoulders are being placed in an eventual loosing situation. If you can get some photos or video posted (profile) that would make diagnosis easier.
BTW- Welcome to the forum!
"Survival will be neither to the strongest of the species, nor to the most intelligent, but to those most adaptable to change."