Love the shots I personally like the sharpness, especially in #2, sort of emphasises the power and energy of the swimmer.
Nice Work.
Would also suggest you watch your gear if your suffering condensation as humidity is very good at creeping into electronic's and playing havoc internally... What you suffer on the outside could (most probably is) also happen inside the body / lens. Get your camera gear as close to the ambient temperature of the event as you can before you get there, this way the air within the camera is also warm and won't condense on the internals.