Changing tail incidence just changes how much elevator trim you need, which can reduce the amount of 'up' throw you have. This is the long way to solving a stall problem. Just use less throw to begin with! Of course, double check the CG as well and make sure it's conservative for the first flight. With any biplane, it's desirable to have the forward wing stall first. Thus, it can have higher incidence.
With a plane that always drops a wing, it could be out of lateral balance, wing twisted or the rudder trim is off.