You also hint in your first post that the takeoff is really steep. Are you holding up elevator all the time you are rolling out? If so, the plane may be trying to come off the ground before it attains enough speed to actually fly. LA engines are really good, reliable engines but are not stump pullers. You might try leaving that elevator centered and letting the plane taxi until it has way more than enough speed to take off, then just a gentle touch of the elevator and the plane will lift off in a very gentle climb out. I personally think those long, shallow climb outs are beautiful. A hot .46 engine will jerk an Avistar off the ground after a very short roll out and go nearly vertical, but a .46LA may not.