SpeedyBen, Could it also possibly be that horses with proven wet track form and fitness get heavily backed into favouritsm and hence win quite a lot of races?

I guess the devil is in the detail and we'd need to see the stats. Personally I have been omitting any races classed as Heavy from my betting/laying lately as I don't believe in backing horses running on Heavy tracks in the summer season, whereas in the winter season horses are more prepped for it.

Just my personal thoughts not sure if others think the same.