I use foam grip covers over Progrip Gel Superbike grips. But as Grn alluded to, your riding position has to take the weight off your hands or it won't matter what grip you use. This is one thing that makes pure sportbikes very hard to rack lots of miles on; the riding position dictates your weight is on the bars (and thusly on the front wheel) which is great for riding twisties, but excruciating for anything else.
The risers will help, but I found the droop of the stock bars contributes as much to hand discomfort as their height and pullback. Bar kits such as the LSL raise and flatten the grip position and put your body in a slightly more upright position, which also takes weight of the palms.
'07 CPB Blue; ZGST windscreen with MRA X-screen adjustable spoiler, tube bar adaptor, PC III, ATRE,BMC air filter, modified stock seat with 2nd Look cover,Scorpion Flame Ti slip-ons, Galfer rotors front and rear, braided-stainless lines, C-F 10R front fender, C-F hugger, C-F inner fairing panels, painted foreman's fins with faux C-F inlay, polished rim lips wired for heated gear and accessories, Givi V35 side bags and E41 topcase with SW-Motech qd mounts