Traction Control/Swaying under Firmware v4.2 ?

[Cosmacelf]

I've been noticed this same fish tailing on my car. At highway speeds, if I accelerate hard, I get fish tailing like feeling. As an experiment, I disabled TC, and found the car much more stable. No instability under hard acceleration. This is all on dry pavement. I just checked, and all 4tires are at 45psi, which is door frame psi (19" wheels). Im going in for service in 2 weeks, hopefully Tesla can fix this. TC shouldn't make it more unstable.