hi
here is your trigger
there is one new constant to set
Percent of the place market bet amount to place in the win market
the reason that you had problems is because the trigger was set to back the win market first, i had to reverse the conditions so it checked the win market prices and the placed the bet in the place market first, followed by the win market.
please use test mode until you are happy with your settings.
mcbee
download the trigger below