Prop Help for Retrieval Boat

[sharkdog]

I just built a retrieval boat using a Skytech H101 and pvc tubing. Overall works good with a few mods. Had to add on to the rudder blade and remove the turn fins so I could get it to turn. The problem I have is there is no reverse with the stock prop. It just churns the water. I can get enough forward thrust that is workable but not reverse. I don't know if this prop can be modified or even how to do it. Ideally would like to buy a prop that would work for this. The stock prop is designed to make this boat go fast and for a brushed motor it does that. I'd like to find a prop with low end torque and reverse.
Thanks.