You'r aperture is right (I'm guessing 2.8 is as wide as it will go) and that last one is showing a good use of composing and trying to go for a moment in the act.
The blur is coming from your shutter speed - 1/10sec is way too slow - get that up to 1/60 at the very least - 1/100 or faster is better. For that your ISO is going to have to go up - 800 at least I would guess. It means noise, but if you practice and try to also slightly overexpose the shot (not so that you get big white patches, but to ensure the most data capture possible) you might be able to get away with less noise.
http://www.zarias.com/?p=481
first part is not really on your area, but keep waiting and it gets onto some nighttime and band photography. A few tips and also a good dispaly of the "moments" aspect I was refering to.