vantage's sniper damage increase to 80 > 100 with 25% dmg amp?

I personally think they should remove the amped damage altogether, and just make it a powerful shooting sniper. Not that it's bad how it is now, but I kind of agree with you. 

Powerful shot, no amped damage for you or your team since it doesn't seem to last long enough anyway. Her ultimate should be feared at a range. Not as strong as the kraber, but stronger than every other sniper.