I have played on many basses that have Spirocore Weichs - the tension seems very nice and easy, and even the gage seems O.K. but when I put them on my bass (which I have tried 3 times) they always seem too thin, and have more tension, and less sustain and less growl. Obviously that has something to do with my setup, but... I have a 50s Kay bass, which is set up very nice. I have a raised saddle, and I have decreased the distance between my bridge and tailpiece to aliviate some tension. Still, there is this weird illusion that strings seem thin under my fingers on this bass and tense compared to other basses I have played. Even the crapy school bass (with a crappy setup) at the high school that I teach at feels easier to play with Weichs on it then my bass does. Does anyone have any clues?