I am a biased Tryndamere main and if you are going to nerf him consider following
Don't nerf the E cooldown, Riot, this ain't it chief. Instead nerf or remove completely it's AP scalling. That's the only reason why AP Tryndamere is played. Nerfing the E cooldown (or reverting it) would make him crappy in the higher elos again. About lower elos, well, even if Tryndamere did 10 dmg with each auto, silvers would still claim that he is OP because of his ult.