I am with krabiker, these shots have this really odd colour set to them. Use a Grey card to set the white balance to the right colour, this will vastly improve the view quality of your shots. You can pick up the Grey Card for 25$ for a portable water proof at Vistek in Calgary.
Also, try to apply a general PP to all the photos, the 1st and 3rd photos looks different in colour cast.
HAHA I swear you stole that Composition from some one! Just Kidding
Another thing to remember, try not to shoot high noon. If you got there early in the morning or late afternoon you could get some really nice light; however, I am not sure on which way the light falls on COP. Try and get the light to fall on the rider face or at least get some strobes set up to manual balance the light
ya i know i played with the levels on the first one and yo i just might go pick up a grey card and ya w/e the last 2 look fine color wise the first however yes is a tad off