Taking a serious look at Zed

What are the things that make overpowered in my opinion?

1. The fact that he is pretty much resourceless. Sure, look the cost of razor shuriken at lvl 1. Its 75, but with a cooldown of 6, zed practically has the energy back already to use it. That and his energy costs don't stay the same, they decrease in cost as he levels. As a mage player, I see increasing mana costs, but Zed sees decreasing energy costs.
2. His mobility. Might as well call this guy Leblanc #2, what with all the blinks he has. This makes zed both one of the safest laners as well as the safest melee assassin in the game. Talon has a blink, but once you're in, your're stuck, you can't just blink out again if things go bad. Diana doesn't have escapes when she jumps in on someone, and Akali only if there are nearby minions. But zed can just ult you in the middle of your team, deal enough burst to kill you and BAM, he's gone. Any other melee assassin can't get out so quickly.
3. The fact that his ult stacks with things like duskblade. Want something that deals % missing HP after 2 secs? Now you're gonna add a percentage of that back into MORE damage? Building duskblade on Zed increases its effectiveness by 45% at lvl 16. What other champs have abilities that stack the effectiveness of items in such a way?

Now on to the suggestions for fixing these things.

Change #1: Make Zed's energy costs static at all levels, and increase the amount of energy restored and damage dealt by hitting an opponent with copied spells. This would firstly: increase the skillcap of Zed, and secondly, force zeds to think about what they are doing when they kill someone. Most of the times I die to a zed, they never manage to land both versions of a spell. This creates a much harder champ to play, but also gives a greater reward for landing more spells. The shadow theme: here's two Zeds both casting the same spells isn't really evident in his gameplay. The basis is there, but its not being rewarded enough for achieving it, or punishing enough for not achieving it. The current way of playing Zed is: land at least all of your spells once, land 1 or 2 autos in there, then blink back to safety and watch the base damages of your abilities kill them. My goal is to make Zed less of an Annie, and more into the Master of Shadows that he was meant to be.

Change #2: The idea of switching places with your shadow is great, but in keeping with the idea of changing energy costs mentioned above, I'd like to see there be an energy cost to switching with your shadows, especially on the ult. If you dive in, and don't manage to hit multiple instances of spells, then you don't get energy back to blink back. This gives counterplay to zed in the sense that if you manage to dodge multiple hits of the same spell, then Zed can't just shrug and back out. Make him feel the pain of overextending by being stuck for a few seconds like all the other melee assassins. This gives zed's something to worry about when they choose to dive you: "Do i have enough energy to get out?" This turns "I'm gonna towerdive that guy" into "Should I towerdive that guy? I might not make it out." To me, this change takes away some of the faceroll that zed currently sees and forces him to think about what he is doing.

Change #3: I actually had two ideas concerning his ult, the first of which is to make the mark damage only include damage dealt by basics attacks and spells. Yes this means that duskblade won't stack with his ult, neither will thunderlords. To be honest though, other champs don't get damage multipliers on those, why should Zed? The second idea is to reduce the range on his ult. This means that a zed would telegraph when he is going to ult someone more. Right now, he walks up to last hit, and suddenly you're ulted. By reducing the range on his ult, this makes it much easier to see when he wants to fight. This also requires him to get much closer to targets in teamfights, giving you the opportunity to slap on an exhaust or some CC BEFORE he is in your face.

Summary: Out of all these changes, the ones that I would like to see most are those concerning the energy costs of abilities and more rewards for landing multiple instances of spells, and more punishments for missing them. These changes would Increase the skill required to get the maximum damage out of zed, but they would still preserve his identity as a champ. They are nerfs to the ease of playing Zed, not to his base damages. They provide counterplay and more risk into playing such a powerful assassin. I want to see Zed keep doing what he does, but I'd also like to see it be more difficult to achieve.

TL;DR: If you don't care enough about a constructive post about how to fix Zed in a healthy way to actually read the whole thing, then you're not the kind of person this post is aimed at.