Is yours the revised kit? If not phone Sig and see if they have any of the heavier gear. The light gear drags badly. As it is mine (MDS 18 powered) with the heavier gear and slightly larger foam wheels takes a pretty long time to rotate on a paved runway. Grass, not likely.

As far as mods go, besides the revised gear I added a shim for upthrust to help make rotation a bit easier. I also fully sheeted the wing, which makes for a slightly heavier model, but also allowed me to use monokote instead of low heat film.

Its an interesting model to fly. It rolls nicely, but is not particularly aerobatic because of the inherent stability of the canard design. Dead sticks (MDS, remember!) are pretty gentle and predictable with no nasty stall characteristics. Its also real easy to get disoriented with it if it gets far out, but as far as I'm concerned its uniqueness makes it well worth the effort.