When I throw my tiny trainer into the wind with a slight upward angle and 1/2 to 1/3 throttle with an s3 battery 6x3 prop the first thing I have to do is grab a hand full of up elevator to keep it from hitting the ground level. Set up is with a slight nose heavy CG. Once in the air seems to be ok. All flight surfaces are flat and level. My question is do I need to throw it harder ?