Brandon, you've gotten great advice already. First, welcome to the forums! We're glad to have another member!
I've been at this a long time & have used a 6 wt extensively for tossing some big flies, even saltwater size when that was the only rod I had. It can certainly do the job, but not as well as a heavier outfit.
Follow the advice that Silver Creek provided, shorten your leader & tippet, and go heavier with them. Bass are not often line shy. When I'm throwing bigger flies on my 6 wt, I'm using the same leaders I use on my 8 wt, which are much heavier than most folks might use with a 6 wt. As Silver said, it's about transferring casting energy. I also use a leader & tippet in the 7.5' length range, depending on the size of the flies. Bigger, I might go even shorter.
You may also have to open up your casting loops a bit. With the resistance a popper provides, it slows things down. Tight loops are great with smaller flies, but don't always work well with bigger. Also, as Silver indicated, you may need to shorten your casting distance. Generally, if you can cast a popper out to the 30 to 40 ft range, you'll be fine. With shorter casts you should get better line control both in the air & on the water, and still catch fish.
I make a point to retrieve most flies & especially topwater flies back to within a very close proximity before attempting another cast. This does 2 things, keeps the fly on/in the water longer, because bass will sometimes follow a fly a long ways, and removes as much slack as possible which shortens the amount of line I need to pick up to make a cast. I've hooked a lot of bass & other species over the years just as I was starting to re-cast, so I keep the fly on or in the water as long as possible. The only down side is it requires more false casting sometimes to get the fly back out any distance. However, that's not a concern, as I'm a firm believer in covering the surrounding waters thoroughly.
Another thing is to watch your back casts. With larger flies, like poppers if you're not allowing the rod to load up properly & completely, you'll have trouble with consistency & accuracy. If the back cast is not "right", neither will be the forward cast. As I said, with bigger flies things slow down some, so watch your back cast to make sure you're timing is on the money.
Let us know how you're doing with it!