If you have a 144" SBA then you'll probably be able to get the Grippers to your liking by setting up the suspension and adding some longer carbides.
However, if it's a 155"-163" Pro-RMK then the Grippers just aren't going to cut it. They just push like mad in light powder.
You turn the bars/skis and the sled keeps going straight pretty much. It was driving me nuts, so I went with C&A MTX's.
Couldn't be happier with the choice.
I had Powder-Pros before on my M-Sled and found them way too aggressive and hard to turn (effort wise) due the really deep center keel.
After about 3-4 different sets of C&A's (Razors, and XTX's) on other sleds, I figured the new MTX's would be perfect on the Pro. They are.
8.5" wide, with a shorter and shallower keel than their race skis like the Razor.
Resulted in much more floatation up front which yielded a more "balanced" feel of the sled, front to back in deep snow as well as that now when you turn the bars the sled changes direction too!
In powder snow the increased effort in the steering is very minimal, barely noticeable, though in crusted over or harder/set-up snow they do cause more feedback through the bars.
All worth it though.
My best friend has a 12-Assault just like mine but he still had the Grippers. After telling me how much he liked them and that he wouldn't be buying aftermarket skis for his, he took mine for a 5 min ride.
The following week he bought a set of MTX's...