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Topeka? As in the capital of Kansas? Heck, we're probably neighbors!! Ha! Seriously, we should get together for coffee, a brew or lunch sometime.
I'm looking at these on my iPad, so that might be part of the issue. But they do look like maybe they're fairly heavy crops. If the 70-200 is the longest lens you have, you're really going to have to be patient and wait for the action to come to you. Frankly, it really limits the amount of field you can cover without having to rely on heavy crops.
I like this set and here are a few of my thoughts:
#1 - If at all possible, you might shoot these from a little more straight on next time. I like this shot--it has a lot of excitement and emotion--but think it might be a little stronger if that emotion and excitement were coming right at us.
The rest...nice action all around. Crops look good and colors and exposure look fine, too. I am curious about the exposure settings being all over the place. You've got ISO and shutter speeds that are all over the place. For instance, that first action image is at 1/500, ISO100, while the static firework image is at 1/2000, ISO1600. Doesn't really make sense. I'd take that 1/2000 for the action and let the 1/500 work for the static images.
I'm guessing the Mk4 has some auto ISO feature of some sort, or you were shooting in Av (or a combination of the two?). Under the lights in a situation like this I'd set the exposure manually and adjust accordingly for action and static photos. I haven't shot in that stadium, but everything I've heard is it's pretty nice and I would be surprised if the lighting isn't top notch.
Keep shooting and keep posting. I look forward to connecting sometime.