My BX uses maybe 3-4 oz. in 200hrs. I have 1370hrs on it.
6 to 8 oz. per 75hrs seems a bit much. That is over one quart per change cycle. If there are no visible leaks then the loss is internal. A compression test can help locate a source of the oil getting into the combustion chamber (valve guide, rings, valve seat). Probably not worth the cost of solving the problem with so few hours on the engine.
If it gets worse probably should look closer.
Hey neighbor! I could be off a bit as far as oil usage is concerned because I haven't payed close attention to the hours vs oil consumption...... Like you say, with 360 hours one would not suspect internal problems........