Hi Tony, You could also consider the
Cramp Buster either instead of, or in addition to the grips you're looking at. They're simple, cheap, and take the tension out of the right hand and arm.
They come in 2 diameters (the smaller one is for the standard ST grip, the bigger one for Harleys, etc., and probably the slip-ons), and 2 widths. I found the wider one too wide - impeding my ability to roll-off and grab the brake. The smaller one is good. However, with my meat-hooks I shaved a bit off the edge to make them slightly narrower again.
Now, I don't like riding at all without it. I contemplated spending the $$ on a cruise control for the trip from Perth to Middleton, but opted for similarly simple
GoCruise throttle lock. I only use that to allow me to get my hand off the grip for a minute or so every now and then, but the CrampBuster is what made the trip possible. I highly recommend this product.
Cheers