If it's any consolation, I've fitted 3 of them now- and in each case, the aft bow was asymmetrical as received. The arc of the passenger half was substantially different than the pilot side. If memory serves, the passenger side had a tighter arc than the pilot's side, and all were the same. Verified by tracing the bow on a big piece of paper, then flipping the paper over and setting the bow back on it.
I spent a ridiculous number of hours trying to straighten mine, the first one I worked on, solo. I was ready to turn it in for the scrap metal value one day, when I found myself in the hangar with a couple of insightful helpers (they were helping me drink my beer). I had previously cut some arc shapes from pieces of 2x4 that I was using as forms/bending jigs, and had them bolted to a table. About 45 minutes after the inspiration to get it straight, once and for all, we were done.
A long-winded way of saying that this is one place where help is very helpful.