Danny, to be fair its quite hard to adjust to wet track conditions if you havent experienced them before, the drop in grip is just so truely massive if you are on barely treaded tyres that experience is the only thing that can help.
Personally I simply wouldnt be on that track in those conditions if I had only half worn out normal road tyres on, its just pointless, you're never going to make good enough progress so better off saving the petrol and leaving it parked up.