I am experiecing a weird back pain just inside and below my right shoulder blade when I play standing up for more than an half an hour. I only get this pain when I play bass. My acoustic guitar doesn't bother me at all. Anyone else experience something like this? I'm right handed and wear my bass about waist level. I play an Ibanez SRX300 and a Fender Jazz. The Jazz weighs more but I get that same pain with the Ibanez. I have adjusted the strap height higher but no relief. I'm thinking it might be the strap itself but I'm not really sure. I am using 2" Dunlap straps on my basses. Anyone have any suggestions before I go to the bone crusher?