I agree and suggest the belt line be at least horizontal to slightly tail higher. It is a fine point and I don't want to be only an arm chair critic. The benefits would be threefold. One is the minimum of drag from separation. Two is the overall angle of attack would minimize front lift for better steering grip. Third a slightly higher tail may generate less lift at the rear when leaned over in a side wind since the air can spill under the tail. The concern that the height and length of the tail could affect stability in crosswinds is valid. In this case you might find that the higher tail may give you some more aero steer into the wind. All these effects contribute to the balance between stability and response which we call "handling". Some experimentation and careful observations will help you find the combination best suited to your riding needs and style. Best wishes for a safe and comfortable ride.
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