1100 damage from a vayne tumble with 2 ad items doesn't sound right.

I can calculate it mathematically. vayne tumble crit does the IE damage which is

2.5 * (total ad) + 0.5(total ad)(*2.5 IE. multiplaier because the Q damage also crits)

so considering vayne has 100 ad from base damage and runes. and 75 from ie. 75 from bt and 80 ad from ult. vayne will have 100+75+75. that puts her at 330 ad with 80 from ult

2.5* (330) + (0.5*(330)*2.5) = 1237 damage + 300 damage from statik shiv.

the 20% nerf reduced its damage by like what. 100?. meaningless.