Can we make zac E into R less reliable?

Its too powerful to be something that basically auto connects when he hits a full charged E.

1s knockup on E (so tenacity or even qss doesnt work) into a 1.1s charge time on his ult, so that gives you a grand total of .1s to flash out of it after his E knockup ends (reminder that the human reaction time is on average .3s~), basically dashes dont even work because just their animation/travel time will be too slow.

This window needs to be increased, i think his E needs to go back to always being a .5s stun, his ult is not supposed to be reliable its supposed to a situational powerful ability to be used alongside allies cc, not just his own E, that would probably make him less overpowered and give him some more counterplay.