Mini Yasuo rework idea

Thought I would share and get opinions:

Passive: Way of the Wanderer, Resolve

Way of the Wanderer: Yasuo has a unique resource called flow that he generates while moving. Yasuo gains 1 movement speed for every 2% flow he currently had.

Resolve: Every 20 seconds, Yasuo generates a moderate shield that last up to 4 seconds (cool down starts after shield ends or is broken). He can reduce the cool down of this by scoring critical hits on enemy champions.

Notes: No longer has double crit chance. Shield has to be played around by both Yasuo and his opponent now. Would probably need to add some kind of effect to let everyone know when shield was about to proc.

Q: Steel Tempest: This skill remains the same for the most part but has a new passive:

Precision: Yasuo gains 10/20/30/40/50% critical strike chance against targets with less than 50% health.

Notes: Still allows Yasuo to have a 2 item power spike, however it adds the restriction of being at least level 9 and the opponent being half health before he can have 100% critical chance. It also allows Yasuo to be a critical champion at lvl 1, assuming he starts q and his opponent is at half health.

W: Windwall static cooldown: 6 seconds. Cost: 100% flow. Make the length static (about rank 3 size on live) and duration is 2/2.5/3/3.5/4 seconds.

Notes: it's still going to be annoying, but of much lower duration for a good portion of the game. Also, using it trades his passive movement speed. Since it costs 100% of his flow, opponents can know when he has used it and when it's available.

E: Sweeping Blade

Notes: this remains the same, but regains the passive for generating flow: 1/1.5/2/2.5/3% per dash.

R: Last Breath

Functions the same, except different effects:

1. No longer moves to a spot outside tower range, but is untargetable during animation. Damage happens on landing so he will still draw tower aggro.
2. No longer generates flow, but grants his Resolve passive on landing.
3. No longer grants armor pen.
4. Gives 30/40/50% increased attack speed for 10 seconds upon landing.
5. Gives 10/20/30% increased critical strike damage against targets hit by ultimate.

Thoughts?