Once in a while, usually near the end of a gig or long rehersal, I get this weird pinch in my left forearm that feels like someone is pluking my tendons like cheap banjo. Happens most often when I'm playing a streched out pattern across 4+ frets near the nut. My bass is positioned with the neck plate right at my belt buckle and up at a ~20deg angle. I've made a conscious effort to not dig in so much and try to use a light touch, but around hour 3, this nerve thing rears its ugly head. It never seems to happen with my old bass (Ric 4001), always with the MTD Kingston 5. The two basses are worlds apart in terms of string spacing and ergonomics...who would have thought that square edged Ric would be more comfortable in the long run?? Sometimes it helps if I move what I'm playing up the neck, so I suspect my strap position...more angle perhaps? Anyone experience symptoms like this before?