I'm a bit late to the party here. As others have said; your build is fine. The mini scout is a stable design and pretty tolerant of an uneven construction. I handed mine to my Dad on its maiden flight, he lawn-darted it and snapped the wing. The rest of its flights were spent with one wing raised higher than the other and also slightly asymmetric flex and weight; it flew fine.
The mini Scout sports a significantly under-cambered wing. Under-camber has a lot of lift yield per mph-increase in airspeed. The faster air passes over it, the more lift that wing will generate, while the horizontal stabiliser remains relatively uniform. So, more lift at the front, the more the plane pitches up. Many real life planes work like this too.
When you crank up the throttle, that prop is washing air over the wing - already generating lift before you've thrown it and it's naturally wanting to go up. This effect is weaker on the larger models (and so the simple Scout and Scout XL won't need 'down-thrust') but many of the mini-sized planes have the prop thrusting the nose down to counter-act the lift its generating. This is particularly noticeable on the Eachine Mini P-51:
The other thing single-prop planes of all sizes have to contend with, is torque roll. As your prop spins one way, it makes the plane spin the other. Combine that with the pitch up and you have equivalent of a bank-and-yank; a standard turn maneuvre. Not ideal when just taking off. The simple solution to this is to angle the prop off to one specific side.
If your prop is spinning one way to make the plane roll to the left, you want the prop angled to the right. This will cause the plane to yaw to the right slightly, which will expose more of the left wing to oncoming air and less of the right wing, causing the left wing to generate more lift than the right wing which would roll the plane to right, balancing out the torque roll.
The handy thing about having the prop angled off is that the more lift or torque roll it generates, the more its thrust counters those effects, so the balance is generally consistent across the whole throttle band. Real planes counter their torque roll and lift with stick/pedal inputs and trim, but when you adjust the throttle/airspeed, you have to adjust your inputs or trim accordingly. Not the hardest job in the world when you're sat inside a plane as big as a bus, but when watching a mini model from the ground, it's much harder to respond in time.