Clever way to nerf Vayne

So, let's say for a moment that Vayne's "Central idea" is for her to be the kiting tank shredding adc. Problem is that she shreds everything else too. So instead of smashing her numbers or breaking her kneecaps (don't get me wrong, I wouldn't be upset to see that happen, but that's not what I'm here for), let's do some good nerfs.

The main idea here is this: change Silver Bolts from % max hp true damage to % BONUS hp true damage. That way the proc does more or less just the base damage to squishies, meaning her overall dps to them would be fairly low comparatively (if her ult didn't have that big AD steroid), but she would still do solid damage to tanks.

For example, if you're a Cinderhulk packing tank, you're probably late game at about 5k hp. Assuming 3k of that was from items for easy numbers, every silver bolt proc would do (.08 * 3000 =) 240 damage, which is a decent chunk, though less than before (yes I'm not acknowledging the base, the base would make it about 300, sue me).

Meanwhile, an enemy ADC would take about 60 damage per proc, almost nothing, meaning vayne can't really 1v1 most end game ADCs. This also means that her trades in lane are hurt as she can't AA-Q reset AA-AA for a big chunk in lane as the silver bolts would do little to the enemy ADC.

So what do you guys think? Would this be a decent solution to our Vayne problems?