Question For Fet Se Owners

I have a question for those of you who own a zipzaps se with the mosfet mod.

1) Have you experienced any wear in the chassis where the rear axle is inserted? With the huge increase in top speed (15km/h according to MicroAmps), I'm wondering how long the plastic material of the chassis will hold up over time at that critical location. Any noticeable increase in how much "play" the rear axle has in the chassis slots over time?

2) For those of you with the extra wide rear wheel kit installed, does your car still flip during turns at full speed and maximum turning radius (like how a single speed bit would turn)? If so, have you tried to add the extra wide wheels to the front also? Obviously the proportional steering and accel. will solve this problem, but I'm just trying to get an idea of how stable your car is at those speeds.

3) How much faster are you than a duel-celled bit?

Any help with these questions would be greatly appreciated!