In reply to chris fox: What is the sync speed of the 7D? When shooting into the sun as in the 2nd shot, try running your shutter to max sync speed and work from that(normally around 1/250th) This would allow you to open up the aperture to around f14 and give you an extra stop of flash power(i.e. you could have dropped the output one stop which would save you battery power and increase recycle time) Of course, if you were after the blur effect seen on the riders jersey then 1/125 would obviously be a better choice than 1/250th.
Good first go mate, get out there and keep shooting.