The shape of your quads are genetic. you see some with great sweeps and some so so. There are a couple exercises I'd suggest. First of all the front squat keeping your toes facing forward and not out plus your feet no more that a foot apart. Second try supersetting a hack squat with toes in leg extensions. The hacks can be hard on the knees so you may need to stay moderate on the weight, but if you again keep your toes pointed straight and then go right into isolating the outer quad by pointing your toes in on the ext. you'll hit them pretty hard. Deep squats are good but will focus more on the hips and glutes once you get beyond parallel. The cornerstone of most bb's legs are squats but if you're like me then they've built a hefty bootie on you too. I get a lot more out of my squats with my toes straight and a feet about 8 inches apart. I will also use a smith machine when perfroming squats this way. Hope this helps you a bit.