Original Zed was in a much healthier spot than Current Zed.
I'm talking when the power in his kit was mostly E than Q, and his ult placed the Shadow behind his target.
This really forced Zed to commit to his kills, and if you want an escape after the execute then you need to cut back on your damage by saving your W.
This gave Zed a huge risk to reward ratio, which is GOOD. You can choose to have big damage by using your escapes as a form of damage, but after that you are helpless.
He wasn't ridiculously oppressive in lane because his main form of harass was a close range E.
Honestly, just revert all of the changes to Zed, and he'd be totally fine. The biggest problem is the 1500+ range blink on R to give him absolutely ZERO risk in committing to a target balls deep, and making is Q way too oppressive in lane.