I have Low Ds - both Shaw & Howard. I can play all the way thru a normal 4 line stanza song in one breath and have some left on the Howard - on the Shaw I need to work hard to get all the way thru just one of the same four lines. You learn to live with it - that's just the way it is!

You can 'fiddle the fipple sharp edge up and down to change how the air is split, and you can also squash the air feed gap (to restrict the airflow a bit too, after which stage you will most definitely have to twiddle the sharp edge. Too much twiddling and you sound like Tweety after Sylvester fed him Thalted Cwackerth!