Front stabilizers don't always help... I have a VS with the spinner way in the back embedded in the wedge, like Dark Pounder and my other bot Darkling 2 (in fact this bot I'm talking about is Darkling 3). It's completely stable in the bot lab. But put it in an arena, and it does frontflips uncontrollably against most bots (not all though). I think there is some weird glitch that affects VS's, that gives them super torque or something. Heaven's Sawmill did the same thing, although instead of doing frontflips its turning was affected.