It sounds like you want to obliterate pool mining all together. Everyone go back to solo mining, problem solved, :p
Even if you keep all the pools under 50% two pools combined would be well over 50% which can do far more damage and faster than 1 pool over 50%.
And it sounds like you're a selfish child who doesn't know how bitcoins work. a single entity needs to be in control of >= 51% of the mining for the double spending attack to even be feasible. 2 entities at 30% won't do shit.