You are not going to find a different commercial tool or process unless it is a proprietary one to do a C&B or unless you outsource the work to someone like t0mmy other than GSA.
I know you are having GSA issues and have asked for someone to point you in the right direction; my suggestion is that you hire someone to show you what you are doing that is causing those issues... give them access to your VPS or where you are running GSA and let them show you how to set things up so you are good to go.
It may cost you a couple of dollars but might be worth the money.