Hi! I am a second year college student from Oklahoma. I have purchased a 1971 B&H Imperial and have been playing it for about 7 months now. While I love the sound and power of the horn I have had a lot of trouble being flat on this horn. On other horns I have had room to push in fom the tuning mark when I was flat but even pushed all the way in on this horn I average 10 cents flat. I have tried embouchure changes, focusing on direction of air in the mouthpiece, liping up and several other techniques but have had trouble getting any meaningful results. I play on a medium shank Schilke 51D. Any tips, tricks, advice, comiseration, or any comments are apprectiated! Or if you want to sell me a new horn thats cool too