Keep basic Aerodynamics in mind: as you increase airspeed, in this case increasing throttle, you will increase the amount of air passing over your wing. The increased air causes an increase in lift. This is the natural tendency of a basic wing. This is especially true of the Aerobird's undercambered wing. This wing is incredibily efficient @ it's job...that's a good thing! It seems to me you have the plane trimmed out fine. Half throttle is what this lil bird likes to cruise at; that's why there is a little notch when you reach half throttle. I push it past half throttle when I want to climb or make a nice flat turn. I have stayed up over 15 minutes by just cruising around @ half throttle or less. This is what makes this plane so fun. You can cruise @ half throttle or less...takin 'er relatively slow.....but also push it up with some increased throttle. But I do take great joy in putting the bird into a dive and leveling out above the field watching and HEARING this lil plane fly by. I can get some great speed nosing over @ about 150 or so and keeping the nose down to about 50' or less leveling out about 15'. This thing rips across the field!

So just keep that basic principle in mind when thinking about how the plane reacts to airspeed.
Faster=more air flow=more lift under the wing.

Remember.....it's a good thing your plane doesn't require full throttle to fly level all the time.

Good luck! Keep it up and have FUN!!!!!

Shane
now where did I put that epoxy.....?