I went with the Progrip gel 698 to help quell the high frequency vibes the FJR puts out around 4,000 rpm. They have a bit of gel in them to provide some cushioning, but still provide good tactile feedback. They work very well for me. About 8 buck's at your local dealer. YMMV
I went with grip puppies over original grips...make the circumfrence perfect for my hand now, and the softness feels good and seems to isolate vibes a bit.