Scrapgun: one more clip, and rework shootguns spread pattern.
Take a Breather: Give him some utility besides selfsustain. For instance, let it poison nearly enemyes. By this way, he could hook + TaB if he is needed, and still he will be doing some pressure to the hooked target.
Hook: I would like it to break less on floor ledges, so It can be used to revenge-hook if Lucio boop you…
Wholehog: Allow to self/cancel, or increase the walking speed or give damage reduction. By this way, it wouldnt considered a suicide button. With selfcancel it can be used to quickly reload.
Their survival is being pocketed and having a smooth getaway ability. They feed less and require much more teamplay to kill. If Roadhog can’t one shot with a well aimed hook on an 8 second cooldown, Snipers can’t one shot from across the map with a no cooldown gun.