Help needed with a few Ashe match-ups

I've been trying to learn Ashe since she released but there are still a couple match-ups that I'm not sure how to handle correctly.

• Roadhog - I've kind of figured out the range to engage him without being hooked, but it seems almost impossible to finish him off. By the time I bait out Take a Breather I'm low on ammo and he's full health again. I feel like I'm just feeding the enemy team ult charge. Is it possible to 1v1 Hog or am I just out of luck without team coordination?

• Hammond - Similar situation to Hog. I'm okay at surviving the encounter by positioning well and using coach gun, it's just really difficult to deal enough damage to kill him before he just rolls away.

• Pharah - I feel like I should have the upper hand in this match up but don't, especially with a Mercy in play. It's like I don't have the range to play back as far back as I do on Widow and don't have the sustain to play close like I do Soldier. Unless I'm in a position where I can two shot her without her noticing me, she just retreats and heals up after the first shot.

Now I know that this is a team game and all of these problems could be solved with teamwork, but what can I do personally to improve my chances of success? When do I hip fire vs scope? When's the best time to TNT?