I'm trying hard to squeeze Creep down to a feather design, maybe with a 33% weight bonus, like shufflers seem to get at BBB events. We'll see how possible it is!
Most FW UK (Robodojo, Fightfest) events allow 50% bonus for shufflers, 100% for walkers. BBB have a lower class arena that can't handle spinners, etc, so only do 33% bonus to avoid larger bots being thrown in to the walls.