I have had 4 or 5 flights with this plane now and am getting to like it. One of the chaps at the field today spotted that my prop was installed backwards! Turned it round and felt better but still a bit 'sluggish' through the air. I am using 2200mah, 3S, 35c batteries. According to the manual, it comes with a 11*7 prop (2 blades) but the profile of it looks quite 'flat'. Would I be able to swap for the next size up in pitch to hopefully generate a bit more thrust?