Well, having just worked with some of this track and the switches 5121 and 5122 with the big bases, the control rail pins for the non-derail should be on the inside rails on the turn-out side. Where the rails make a V
The other power district isolation pins should be on the center rails. You only need the U for common everywhere as they are tied together internally in the ZW.
I also used a 90°, so nothing tricky about that. I would suspect a dead center rail away from the cross and the second roller of the engine on the plastic center of the cross.
I would suggest to solve track power with a meter using continuity and no power and then deal with the powermaster communication issue.
