While I agree both of this champions needs a nerf this is How I would nerf them since I find your idea horrible as a dedicated player of both...
Vayne Q Ratio increased she received REVERTED.
Vayne can NOW do E>AA like she used to in season 4
The fact that vayne lost her E>AA spreads CANCER to all the vayne mains ever since this was changed. In fact I ONLY main Vayne when she is ridicilusly broken because they removed E>AA. WITHOUT IT SHE JUST FEELS ULTRA CLUNKY.. to the point where her rightclick can get fking disgustingly bugged i dont want to go in the details
Vayne did need a mini buff But Riot made her broken with all the consuctive buffs FOR lcs big Plays. Revert the most important One which is the bigger AD ratio on Q
I dont think we should revert the fact that Q>AA can do extra to towers though since laneswaps are no longer a thing because of Botlane Tower changes and vayne was fantastic champion to lane swap with which was indirect nerf to her (Bot and toplane) As a really vulnerable early game champion
As for Lee sin - another victim of RIOT PLAYING Favorites for LC$. Lee sin is borderline broken in good hands
IN short I ll try to explain why your specific nerf idea is horrible
HIR R SHOULD NEVER BE INTENDED TO USE AS AN EXCECUTE (because there is no wombo cc combo then) Its just ultra counter PRODUCTIVE IDEA
HIR Q IS ALREADY A FKING EXCECUTE WHICH WOULD JUST CAUSE A CONFUSION. Do I excecute with R==? Do I excecute with Q==?
I really want to know how your fking brain works? Most ilogical nerf suggestion I saw in a while
The base dmg nerfs are irelevant. AD Lee sin is situationally viable his high base dmg and ratios were never the problem. You would just remove a 2/10 games where lee gets to go full ad because enemy teamcomp allows him to.......... while tank lee would be just as good there
If you want to nerf lee sin we could start with nerfing his base movementspeed which is to high while he has so many dashes
We could Increase the energy cost on some uses So that he has to aa a bit more if he wants to spam
Those nerfs I would welcome
As for increasing cooldown on his ultimate.. That would just make me unhappy......