Evening Taylor.
Man how I sympathise with you.
I hate to think how much grief my 7D gave me when I got it.
A few points.
1. On your shot you say the focus was on his right eye but it is his left eye that has the sharpest focus. I suspect that there has been some camera movement as jbee mentioned. I found this to be a major factor for me.
2. Definitely agree with Scotty about the speed and the tripod. I had to forget about 1/100 unless on a tripod. The 7d is a fast camera and wants to work fast and hard. Move your speeds up and try not going below 1/250.
3. Don't use burst. Unless you are working at 1/500 or faster the camera movement, from my experience, will be the same or worse.
I personally don't use manual select AF. This is something I may use when I get back to the sports shooting. I have found
this article useful. Also
this was also useful.
The major thing I have found with the 7D is that it is a fast camera and wants to work fast. If you want to work slow you need a tripod. So, fast shutter speeds, fast lenses (you got), and lots of light.