The biggest issue with Vayne is that her kit is too good at self peel AND chase- let's fix it!
Are you someone who needs to get onto vayne? Nope Condemn, tumble, ult.
Are you someone who needs to GET THE HELL AWAY FROM THIS CRAZY HOE? Nope Condemn, tumble, ult, passive.
Vayne's lore is supposed to be at chasing down and killing monsters. SO the chasey assassinatey duely part is awesome. But how can we separate that from the "lol can't touch this dananana" that she is right now?
Thoughts: Tumble- Fine as is, AA reset seems super powerful combined with Truesilver bolts but i think that means we should retune bolts instead. Leave the mechanic in place.
Bolts- Make the base dmg Ad based and the bonus damage true dmg. So we can mitigate some of it. Alternatively- what if it dealt AD in TEAMFIGHTS and true damage when alone? Too much to think about in game? I think it could do interesting things to her teamfight/vs splitpusher identity.
Condemn- If target is facing vayne distance knocked back is halved and potential stun is halved. This is probably the one that sticks to her identity the best. Kill the fleeing cowards and monsters, face off against the ones brave enough.