RE: !HELP! Serious balancing issues
If the rudder servo is all the way in the rear, change it to a pull pull. That plane l;ooks like it has a 3 to 1 tail moment so 2 ounces in the tail equals 6 ounces in the nose. You could also go to a heavier prop such as the APC, or a heavier prop nut, or a heavy spinner. It also looks like there may be wheel pants that go with it. If you look at the main gear there appears to be holes near the bend down by the wheels. If you have wheels pants, put them on. It will help also
The may be other things but I'm not familiar with that plane