I had the same problem with my 650 when I got it. It just looked like it wanted to fall over on the side stand. I blocked up the side stand with wooden blocks to what I thought was the proper angle and measured the height of the blocks. Then removed the stand, (damn exhaust in the way), and cut the center of the stand pipe. I had some rod just the right diameter to slide inside the old stand pipe and measured how far in it went, then cut the rod so that it extended the stand about 1-1/8". Welded it in after making sure the foot would be properly oriented when extended and retracted. Painted it up and was good to go. Except--- I had added so much length to the stand that it will not retract unless the center stand is retracted first. Not a major deal, but something to watch out for.
In retrospect, I made mine a little longer than necessary, it works OK, but a little shorter would have worked better. Make sure you lube the stand pivot when installing, the reason these go bad is that the holes become elongated from lack of lube and allow the stand to pivot too far.