I can't imagine the feeling of driving that thing. Also, the sound of that jet engine is incredible. Fantastic. Especially after you put so much effort into such a project, you are rewarded with a lot of fun.

next time put the fuel line in the bottom of the tank rather then through the top that way  you can  let gravity help with the air and sloshing situation also you might want to add a a reversed wing to create down force on the nose and tail like they do in indy car racing as it looked like the jet was trying to lift you up slightly. The icy cold tires were also a big factor in your turn, not to mention the lack of rotational mass at the rear axle to offset the braking torque, the front brakes would add a lot of stability and keep you in control long enough to correct the error.