OK, what exactly do you have? Butterfly is normally a drive system which has an actuated shift between a standard tank/skid-steer system and mecanum (your link doesn't seem to go anywhere). In holonomic mode, it has wheels
effectively oriented at 45, 135, 225, and 315 degrees. Kiwi is usually a three-wheel system utilizing omni wheels oriented 120 degrees from each other (probably at 120, 240, and 000, or 60, 180, 300, though other angles are possible. The only thing I've seen recently which might be a cross between the two is what I dubbed a
Mackiwi, which was debuted by 585 recently at the Fall Classic. It has wheels at 135, 270, and 315.
How are your holonomic wheels oriented, where are they placed, and where is the center-of-gravity/center-of mass in relation to the wheels?