What you are describing sounds a lot like what mine does under hard acceleration. But when mine does this it's actually cycling power to the front wheels on and off rather quickly, like it thinks the back tires are slipping (that's not gonna happen) I can see the TOD bars flash full and back down over and over and feel the surging that coincides. I've heard other owners mention this after adding larger or more aggressive tires. I have 33 inch MT tires and that's when I noticed it starting. It hasn't bothered me enough to worry about fixing it. I don't often leave a stop under full throttle...
To see if yours is doing what mine is, just watch the TOD graph and see if fills up when it surges.