ORIGINAL: combatpigg
I wasn't aware of the 10x3, sounds like a good choice. What your plane needs is to shift into a lower gear, not flat out speed. The .25s that I have run get bogged down pretty easily. I would have suggested a 9x4.......you might find that the .25 likes to fly your plane with less load instead of more load.
10x3 is not recommended for the .25 as it will produce only about 35mph airspeed at full throttle, which is only marginally above stall speed for the stik and does not meet the recommended prop diameter to pitch ratios.
O.S. recommends a 9x5 or 9x6 prop for sport flying and if moving up to 10" a 10x5.