All you need to do to balance Tahm Kench is this:
Reduce the time his freaking stacks last on you, holy shit. They last so damn long and you aren't able to be near him once he lands one on you because applying the next two is a cake walk. Also, if you're laning vs him and the wave is just slightly past the middle of the lane on his side and you're melee, you can't lane anymore. He lands on Q on you and you're getting devoured and eating a turret shot or two.