So 2f2f has now replaced normal goldrush with this, congrats!
However, there is a nagging problem. Its a big steamroll for BLU, but I have 2 possible fixes.
1. After capping the "stage" instead of the doors opening right when you cap the point a timer is set for say 1 minute. This gives RED a bit of time to get some gear up but without the hole moving to the next round frustration.
2. Right before the doors you have a fake CP. If you don't like the idea of having a timer control the gates opening try it out with the CP
With any luck one of these will fix the steam rolling.