How to responsibly buff Caustic

Caustic is a bit underpowered. 
Few things. 
1. Caustic shouldn’t really share what enemies are in his gas with his teammates. It’s probably just that Caustic is supposed to see much clearer through his gas, which is probably why it’s only him. 
I’m not fully against this, but I have some doubts.

2. His gas doesn’t really need much of a damage increase. It is already kind of similar to Gibraltar’s ult, if someone decides not to avoid it they’ll suffer a lot of damage. I’m thinking that the damage cap should be raised, although not too much. Not necessarily a straight up damage buff, but it would still function. 
3. It’s not great that his gas affects teammates, but I do see what BillyCrash100 is saying. Caustic’s gas gives a big advantage to Caustic, and if some of your teammates also get the advantage, it can be a little too op. This is similar to how Crypto’s emp still affects himself, in order to balance out the big advantage it gives to his team. I’m not saying that they shouldn’t reduce some of the debuffs, but they also shouldn’t reduce it too much. 
4. Yeah, Caustic doesn’t really have much of a fortification thing, but he basically has a Bangalore smoke that he can see through and it does damage. It would be a great idea to buff the aoe, but at some point he will be basically a better Bangalore. (In terms of gas.)

5. His gas traps are easy to shoot, in some situations. They can also be difficult to shoot in others. Instead of increasing it’s health, maybe change the hitbox of where you can shoot it so that it is a little more difficult.