Just my opinion, but using aerobars to address a soreness issue is not the ideal solution. Best to figure out the underlying fit (or physiological) problem that's causing the soreness. A properly fit bike should not cause pain.

I was getting some annoying pain in my triceps on longer rides, and my chiropractor ride buddy told me it could be referred pain from my neck. She gave me some neck stretching/strengthening exercises to do, and the pain went away.