From the IVO website it says to use a hacksaw.
• If you wish to increase top speed or decrease cruise RPM, switch to a 2-blade prop or
cut the 3-blade prop to smaller diameter using a hack saw. As long as you cut the same
length piece from each blade, the prop will remain in balance.


I would be careful about trimming the ends if you are getting good rpm cause I know you want to do more sandbar landings. A longer prop usually gives more pull and better climb.