I don't know the specifics of the 4*120, but if it were my plane, I'd set for even with the wingtip TE and fly it. If you're set a little low, it will be like flying around with your flaps slightly down, which is no cause for alarm. If you're set a little high, it will be like flying around with spoilers partly deployed, again no great emergency. In either case, you will compensate with elevator trim.

Optimum setting would be for minimum trim on the elevators. After it's trimmed for hands off straight & level (at about two-thirds throttle), bring it down and eyeball where the elevators are trimmed to. If they're trimmed up, then you might readjust your ailerons to bring them both down a few turns of the clevises. Or vice versa. Then fly again and reset your elevator trim. None of this is any reason not to put your plane in the air.