First off...get some chalk, if your gym allows it...
With your sumo, you're actually pulling your shins away from the bar on the way up...this is going to create issues especially when you go heavier, and it'll make the weight difficult to lock out because not only do you have to pull the bar back towards your body on the way up, your hips are placed even further from the bar, and that's where all your power is coming from in the lock-out.
Your shins should be RIGHT up against the bar, and the bar should literally be scraping up your shins on the way up.
When you set-up, don't think of it like a squat. Bring your shins up to the bar, force your knees out as much as you can, and focus on trying to get your hips as close to the bar as physically possible. Then you're going to lower your hips, squeeze your chest up and force your knees out as you pull up.
Here's a really good video from Team Wildiron explaining the sumo set-up:
With your conventional...don't roll the bar out like that. Set up properly before pulling. By the time you pulled your were hunched over instead of flattening your back and squeezing your chest up. It's very important that you don't let your chest drop because this will cause back rounding.
Rather then touch-and-go, take a second to reset between reps. Always push your chest up before pulling.