Gw working as intended

I realize what you are saying, and anyone that currently are beating GW on a daily bases with multi zeta characters, all have been there before. Part of it is a power curve jump, part of it is their calculations on power rating that is being used.
All I can suggest, is farming different characters, different teams ( many have been mentioned here ) or breaking the node.
Months ago, even with broken nodes, a Four Zeta Team, and a large roster, I was locked getting no farther then beating Node 10. I changed up a team, and now clearing daily again, That part, is just the adjustment to the "Meta" teams people are running in Nodes 9,11, and 12