I presume you are not laying the field?

I want to clarify my POT.

I think the method of my POT calcs is not accurate, and if so, hopefully someone will confirm/correct me.

For the POT I have been using the highest liability layed per horse. For example, if the highest liability I inputted was $40 on no.5, and it was beaten and gave me a profit of $4.00 on the race I would calculate a POT of 10%.

However, I think that the actual liability should be the highest amount I could possibly lose on a particular race. For example, if the worst result was a loss of $5 but I ended up winning $5 I would assume the correct POT should then be 100%.

Assuming the highest liability per race was $4 (this is most likely overstating it) then the POT so far is slightly over 50% - I don't think laying the field is necessarily a bad way to go.