Also, look at the quality of the sockets you are using. If you are using something cheap go for a higher standard. I had the same issue on a Bonneville. The head of the socket just twisted. I went to Craftsman (I know they are not like they used to be), or some other higher grade, and was able to break them free. Destroyed a couple of sockets in the process and returned them. Angle and alignment are crucial when they are stuck like that- just like when trying to drill a screw and you are off on the angle and it just spins. Last resort would be to slot a groove and use an impact driver, then replace the bolt. It's a mystery to me how they get tighter than originally torqued.