While I Do Appreciate Zeal Nerfs...
I'd rather see their Critical Strike Chance and/or Movement Speed bonus toned down a bit.
The movement speed bonus I think is too overbearing since ADCs already have high range, and the critical strike chance is going to be way too high with the new IE.
What I would change with Zeal and its upgrades:
Attack Speed: 15 -> 20%
Critical Strike Chance: 20 -> 15%
Movement Speed: 5 -> 2%
Total Cost: 1100
Reducing Critical Strike Chance and Movement Speed while increasing Attack Speed and decreasing cost to compensate, these changes will also carry over to its upgrades.
Attack Speed: 35 -> 40% / 30 -> 35% Respectively
Critical Strike Chance: 30 -> 20%
Movement Speed 5 -> 2.5%
Total Cost: 2800 -> 2600
Hitting the Critical Strike Chance the hardest for these items because of how powerful Energized Strikes are, especially when both items are purchased.
Attack Speed: 40 -> 45%
Critical Strike Chance: 30 -> 25%
Movement Speed: 7 -> 3.5%
Total Cost: 2800 -> 2600
Didn't make sense for the AoE focused upgrade to also give the most Movement Speed Bonus.
Attack Speed: 45 -> 50%
Critical Strike Chance: 30 -> 25%
Movement Speed: 5% -> Unique Passive: 4% Movement Speed, this bonus is doubled while in combat with champions.
Total Cost: 2800 -> 2600
Slight rework for the Movement Speed Bonus, doubling down on its identity as the mobility/dueling oriented Zeal Upgrade.