1st outing, a disaster

I went to SS19 subang track for my first optima mid run in 11 years with high hopes. To sum it up, there was more bad than good. the good first. The car was really silent and smooth ! Making only as much noice as any other modern car on the track ! The Car was also very fast on the straights with the 10.5T motor. i heard other people were using 5.5T to 7.5T. Also the car tracked well and braked straight. Now the bad news. The optima mid understeered horribly, it was so bad that even the 2WD cars were over taking me in the corners ! I had to slow down so much just to corner tightly. I beleive its becuase of the UM-14 original bellcrank, which had too much slop in it, it was practically allowing the front wheels to flop left and right about 10 degrees without even engaging the servo! Also on the ground, the servo cant turn the wheels to full lock. So thats probably why the car understeered so badly. The more i pull the throtle, the more it pushed, if i pressed to much gas out of the corner, i lose rear traction.
Next i had trouble going over the small jumps. The car kept flipping front wards and slamming the wing bad.
But i finally got the hang of it, and gassed partial throthlle until i hit the jump and pressed full gas, and the car cleared the small jump. The big jump was another story, i crashed the optima mid in every possible way. Landing nose first on the front side of the landing, landing sidewards and somersaulting countless times.
But i did manage to clear the jump nicely about 3 times. the trcik is to climb the inclination as high as possible, the go down with partial throttle, then as you are reaching the top of the jump gas it all the way, and keep on the throttle until the car clears the jump. The problem is right after the big jump is a sharp 100 degree corner to the left, so i tend to let the gas go in mid air to slow down the car to not overshoot it, but that is causing the problem with the big jump. I must overcome this mental handicap.