Mate great vid look forward to watching much more!

So, raise the car, stiffen the rear end, reduce the steering performance, soften the front end, give it some body roll ability . If that fails you'll have to switch to toe out wheel alignment and start slamming the car into corners at a greater speed and when you back off the acceleration, the car will start the turn by itself. Toe out will cause you to turn early. The middle of the track is your ideal practice and set-up the car line. The middle line is the fastest line around a track. You MUST do your testing on a circle track. When your car is at half throttle, it's sagging in the rear. You haven't done a basic set up yet. Level the car when it's at half throttle. Drive it in circles and tune the car to be at half throttle and on the middle line of the circle track. Tune the front end to be a toe out setting and still be at half throttle and in the middle of the circle track. When you go around corners, I want to see the car in an over steer position during the middle of the corner. That means the rear end must be stepping out and wheelspining . I don't want to see the car gripping corners. I want to see you drifting around corners at high speed. Failure to do this results in 10 push ups!

There's a video on this track with a thundershot I'm sure you saw that video. Vintage RC ran it there.

After the second double jump there's 2 right hand turns and then there's a left corner. That left corner is off camber and it exposes your car is too low and it causes your suspension to Max out and spin the rear end. Your car needs to be raised up and the front end must be soft enough to hold the line for that off camber left turn. You car saggs in the rear when it's going in a straight line under power. You must stuffed the rear suspension. Your car has too much steering power. You must reduce that. It's got too much grip in steering which causes you to hit the rope and throw the rear out.

Your car looked like it had a heap of understeer , specially on power. Have as close look at the other cars in the same race , they change direction much quicker ( loads of lap time just there)

Seems like you're having a rear traction problem too.