Before you release I strongly suggest that you start map construction threads on these two boards:
www.firetrill.com/forums)
www.chopshopservers.com/forums)
>95% of the knowledgeable, experienced JA CTF players go to one or both of those boards. Mappers from within the CTF community have greatly benefited from the suggestions, criticisms, and testing that their maps have received. If you want input from players who play hard-core CTF and really understand issues like speed routes, bottlenecks, weapon spawn points, amount of health\shields\ammo on the map, etc. those are the places to go.
Just be forewarned that they are a somewhat opinionated and rude bunch. You will have to have a thick skin. Be prepared for some "your map looks nice, but gameplay sucks" to just plain "this map sucks" comments. But then they will tell you how to make it better, and the feedback is invaluable.