Every match I’ve played on CW that gets to the floody stage is an auto-win for attack. The main reason for this is the overtime kicks in once a hack triangle is down and the times up (its very hard to stop at least one triangle going down). By this point def are spawncamped as they are left with a single chokepoint (unless you can trick jump your way over the big yellow pipe which also makes you a fairly easy target) after att close the gates.
I would say remove the gate close side objective giving defense more of a chance to escape their spawn, and/or remove the overtime rule.