Hi,
You didn't say which classes you were playing? I think the best way to beat endgame builds is simple: don't let them get to end game. Patronizing aside, I played a game where I was QoT with a Regulus player and a noob that left for the AI to take over. The Regulus was spanking down hard on the enemy DG's but we always found ourselves running between captured portal flags. At some point, they just captured both our portals. It was game over.
The beauty of the Conquest type game is that no one says you have to engage in DG vs DG combat. Capture flags, farm grunts, upgrade Citadel, etc. Being a mostly QoT player myself, I don't usually have many kills under my belt, this does not mean that I don't pull in most favor. I usually find myself running away from 1v1 confrontations at end game because I will get spanked. This is not the QoT's forte. What do I do instead? Well, it's a frickin' conquest isnt it! I shield teammates, debuff armor with AoE spikes, take down towers and so forth.
What I would do if I was war rank 10 and they were say.. war rank 6 is deprive them of flags! They will never reach a higher rank and they will be too busy doing the following:
- trying to kill enemy DG's
- trying to capture flags (wastes their precious time)
- trying to recapture their own portals (this is the main thing you should be focusing on)
- defending their base against onslaughts of grunts (upgrade them at citadel, ftw)
Get this concept out of your mind: In a Conquest type game, if you can't kill enemy Demigods this doesnt mean YOU ARE LOSING. Hope I have made you think differently 
PS: I really enjoyed your UB ooze build. Keep em coming!