Not much power will be lost considering you will have 154hp with the X-3 and 168hp with the 2017 XP. I saw a new set up that STU was using on the car displayed at Alternative Off-road booth. Interesting set up. I forgot to snap a picture.
As long as the paddle tire weighs the same or a little less than the stock tire set up there will be no loss of power. Even if they weigh slightly more you are not going to notice any significant loss of power. Maybe if you are drag racing on the flats or up a long steep hill, but not many of us do that often enough to matter.
As long as the tire profile and paddle profile are good that is all that matters.