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Thank you for your comments and critique.
Regarding my underexposure technique, I think shooting in manual would have been better in this stadium because the lights were pretty good and relatively consistent across the stadium, although in a lot of our stadiums the light varies significantly, particularly bad at the ends of the stadium.
And regarding my unconventional underexposure technique, here is my (perhaps flawed ) rationale, I shoot in Av mode at F 2.8. The camera picks the fastest shutter speed. So if the shutter speed is less than 1/640s, rather than going up on the iso to get a normal exposure and an acceptable shutter speed, I underexpose it a bit (1/3 stop to 1 stop), thus the camera picks a faster shutter speed and I still have my lower ISO. I will try it with normal exposure with the concomitant higher ISO and compare the two. Probably sticking with Manual would be better.
Regardless, I do think the photos lack some sharpness, probably, at least in part, because of my noise reduction treatment. I appreciate the feedback.
For high ISO images with noise, do y'all use Lightroom for the correction, or do you recommend a specialty software product like Noise Ninja to address the noise? Which do you like better?