Something is allowing the LH wheel to pitch forward/inward when power is applied. You note the control arms are new, so the assumption, at least for now, is that their bushings aren't at fault. Something you could try is to lift the LH wheel off the ground just a bit by setting a floor jack under the control arm as close to the wheel as you can get. Once the wheel is off the ground, grasp the tire at 9:00 and 3:00 and work it back and forth and see if you can detect any play in it.

I am saying to jack the wheel up from under the control arm so that all the steering components are close the angle they're in when you're on the road. Jacking the car by the chassis and letting the wheel dangle down may introduce an angle in the tie rod, or whatever, at which the slop is diminished.

About the control arms - people have complained that some of the aftermarket control arms are junk. My local Volvo independent shop tells me that control arms are one of the items that they insist be Volvo label, because of the bad luck they've had with the aftermarket stuff. I believe the Volvo OEM's may be made by Lemforder but I'm not absolutely sure.