It's not just the Q. But the Q should deal less for being an instant grab. It should deal 70/125/160/205/250 damage.
His W got its side effect, but...
His E needs to cost him something and do less in early.
If you don't do this to Blitzcrank, he will be the most OP tank as of right now.
Gives a bonus 20/40/60/80/100% damage based on current AD and knocks champion in air.
Cost should be 25/35/45/55/65 mana.
I'm sick and tired of seeing Blitzcrank as a pick just for his oppressive power so it will be an easy win. If he going to be played as a support, he should be treated as a support.