Corki's rework- auto attacks nerfed or buffed?

From what i understand, corki's auto attacks deals 55% magic damage and 55% physical damage.

I wanted to calculate the total damage in level 1 considering the vayne opponent.

By using standard adc runes and doran's blade, the live total auto attack damage of corki(72 physical +7.2 true) at level 1 after armor reduction is 63.36.

The total damage vayne recieves from the split auto attack after MR reduction and armor reduction is 58.1.

So basically, corki has received a 5 damage nerf. however, I understand that the bonus 10% damage can now scale with crits and sheen procs.

I'm not sure how much the crit and sheen proc buffs are effecting corki's AA damage, does corki now scales better to late game ?

I'm a corki main, and I play corki in the bot lane and the mid lane, so i'm a little worried about these changes, because corki's power in lane comes from his auto attacks which hurts alot. For corki In order to abuse mid game power he needs to get a leverage in the early game, and it looks like its been changed.

I'm not sure about the new W mechanic, but it seems corki will be more vulnerable in lane because of the regular w nerf.