You may have multiple issues here, but the first thing you need to do is get the takeoff under control. My guess is the fin and rudder is getting blanketed some and is hence not effective. That problem is compounded by the gear being too far forward. Finally, the wing's lifting you off too soon and is probably very close to stall. My suggestions are to move the gear back some and drop the incidence in both wings. You need to try to get the tail to come up in the takeoff run before the plane simply leaps off the ground. If the tail hasn't come up then something is wrong whether it is balance or incidence. You need to resolve that because the plane is not ready to fly and it will stall. Once you get the tail to come up during takeoff you can run on the mains until you have sufficient flying speed.