17 MPH is an odd speed to be going, there may be other issues preventing you from 19.x??
As far as tires, going from 8 to 10 inch should give about 8 -10 percent gain in MPH. With the on road driving we do in TV, you should not notice any torque issue or at least I have not. It is even faster up the hills in Mallory (Odell) with larger tires.
You need to make sure that a 10 inch wheel with a high profile tire such as a 205-65-10 will fit on your cart without rubbing.
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