Does anyone who has experience playing the Presto Balance Hybrid (Medium gage, preferably) strings have any comment as to their upper register playing? I heard them on Herve Jeanne's (amazing) website and loved everything about their sound, EXCEPT that the thumb position playing sounded dumb, to be blunt. Almost muted. I'm wondering if this could have been just a product of the strings not agreeing particularly well with his bass, or if this is a problem many people have. Any info is greatly appreciated.