Wow, You're describing exactly what I started to feel during a 1,500mi 3-days on the bike-ride. Now it hits me after just being on for 30 mins. Its a hot poker type of pain just below my scapula but closer to center of back. I too have a throttle lock but that's just a momentary distraction. Bike had Rox risers on when bought but I've never been a fan. Rolling the bars back any more makes the switches akward to reach. I thought it was more of a pinched nerve so I bought a better seat hoping that will help but I'm still waiting for that to arrive. If I can come up with a solution that would be amazing. I just turned down a trip thru Wyoming because I didn't think I could hang. When that pain comes on, it happens fast and there's no un-kinking it once its on.