Steering twitches under hard acceleration in Sport mode

[Def-fid]

Not sure if it's normal, but under hard acceleration in Sport, my 9-5 Griffin V6 twitches distinctly.
Like torque steer but side to side. Could this be worn front subframe bushes ? Steering ball joints etc are all fine.
51,000 miles, Avon ZV5s with about 3mm tread left

[sgould]

When my 9-5 did this, I found that the rear shock absorbers were worn out.  Once off the car there was two inches of play in them.  But not sign of any leakage.  The 9-5 is notorious for wearing our its rear shocks.

But any serious wear in any of the bushes could cause this.