Okay, I took a look at the VMF you supplied. You were missing a tf_gamerules which was causing your map to crash.
I went ahead and made a setup with a single passtime spawn that just uses point_pushes to push the passtime jack to the side that didn't score the last goal. It also randomly chooses a side at the start. It's not perfect but it should work.
I went ahead and added a timer as well.
You were using decals for the wall decorations, you should be using the overlay tool
instead.