squirelly drive

[t_raven]

Hi All...
This may sound weird, but I thought I would ask on here if anyone has had or has the same issue I seem to have on my 01 Boxster base (tip)

Last year, before I put the car away for the winter, I took it into the dealership for a leak from the tranny...
Turns out it needed the tranny shaft seals replaced so I had this work done and also had them replace the CV boots at the same time. Also, had them put new Michelin Pilot sports plus a full alignment all the way around so the car would be good to go once the winter was over..

Well, this week, as the weather was ok, I took the car on a 6 hour trip each way and was having a great time until some idiot in a pickup truck thought he could out corner me on a sweeping lefty on the freeway... I normally wouldnt react to this type of thing, but long story short, I was hoping to see this guy lose control of his truck trying to keep up with me.... but it was me that almost lost control which totally suprised me...the car reacted to the input of throttle and the tight turn totally out of character to what I am used to..

When I am turning to the left, and apply the throttle, the car actually veers to the right slightly... when I compensate with the steering it is ok until I lift off the throttle, then the car veers back to the left... as you can imagine doing this at higher speed, and the reaction to the veering to the right causes a lift on the throttle, the car almost goes out of control... now, if I do the same with the throttle and steering while turning right, I have no problem at all and can corner no problem, but any kind of throttle input while turning to the left causes the car to veer back and forth...it is kind of scary!!
If I coast around a left turn, there is not a problem.. it only happens when under heavy to moderate throttle input...

My guess on this, as it didnt happen at all before I had the tires installed and the alignment completed is that perhaps the alignment is not correct and that the rear wheels are not parallel to each other? Does this make sense?
I have called the dealership and the response I got was that the new tires are much grippier than the old ones that this will go away as they break in. I dont buy this at all, so before I go throwing more dollars at this, I wanted to hear if anyone has had this happen to them before and what the issue was...

Please help!