The medium weight Demondrae has arrived. There definitely is a sweet spot for mouthpiece weight. The weight seems to add stability (especially noticeable in the higher range). To much weight reduces "openness" though.
This medium weight (again created by Ken Titmus) seems to fit me best. For my ears the lighter weight is (almost) too open, resulting in a overly brilliant sound in the high range. Also the slots became really wide on the light one.
The Medium weight mpc reduces some of the brightness, but is not as heavy as the original where coloring of the sound is more difficult.
I'll play both mouthpieces for a while before I settle on one. But first impressions are that the medium weight fits me best.
Weights of the mouthpieces are:
Original: 201 grams
Medium: 175 grams
Light: 151 grams
Euphonium: Adams E3 Custom Series (SS Bell)
Trombone: Benge 175F