Interesting Zed Change

After seeing Zed get gutted for no reason and seeing his win-rate drop, i feel like he needs a slight change. The biggest change is to his ultimate

ACTIVE: Zed becomes untargetable for 0.75 seconds and dashes behind the target enemy champion. Upon arrival, he marks the target for death, ignores unit collision, and spawns a shadow that lasts for 6 seconds at the cast location. After 1 second, you can Death Mark 2 reactivate the ability, and it will cause Zed to swap places with this shadow. After 3 seconds, Death Mark will trigger, dealing flat physical damage plus a percentage of all physical and magic damage dealt to the marked champion while it was active. NEW "If Death Mark does not trigger, Zed will instantly be able to do bonus damage (15/25/35%) with his abilities to the champion that Death Mark did not trigger on for the next 2/3/4 seconds"

This is very similar to the fizz ultimate change. With this change Zed will be allowed to do damage even after someone zhonyas or qss's his ultimate. He will still be vulnerable to tanks as this change wont affect anyone who death mark triggers on. If a person zhonyas when Zed ultimates, Zeds will have to decide if they should stay around for the bonus damage or risk getting collapsed on by other enemies. Finally, Zed will be able to do something more to squishes in the late game forcing the front line to protect the back line from him rather than to do no damage or wait till zhonyas/qss is used Note* His bonus damage if Death Mark does not trigger is less than if his Death Mark does trigger Current Death Mark Bonus damage: 20/35/50% If any questions let me know and discuss your ideas below