My father had his winters changed over to the 3-season by KalTire and reported the pull-to-the-left as well (no vibration). I'm interested to hear what they say - my dad's on a cruise from Singapore to RomeDubai, so he hasn't had his addressed as of yet (and I haven't driven it to experience the issue myself).
just as a follow up...
first off, let me start by saying the Tirecraft location here (Fanshawe Motors) has provided me with excellent service and have been great to deal with the entire time...when i called them a couple of days ago with my concerns, the concern was to ensure i was happy with my purchase and they showed genuine interest in resolving my issue to my satisfaction.
so, this morning, i dropped my car off, they called me a cab, and the cab took me to work...later on, they took the car for a short drive to verify the issue, which they confirmed...they re-balanced all tires and told me the two rear tires were off about 1/4 ounce, which would cause some slight vibrations mostly noticed at higher speeds (which is when i noticed it)...they also confirmed the slight pull to the left, so they switched the two front tires to determine if the issue followed the tires or not, then test drove the car again...the issue was still there, so the issue was not the tire, but the alignment (despite me paying $25 at the dealer to check it)...he mentioned some shops use a visual set up for alignment checking, which doesn't always work the best...their shop is the actual alignment machine where you hook all 4 wheels up...he printed off the results, which confirmed a misalignment in the front end...i gave him the go ahead to align the car ($100), which they did, then tested it again and confirmed everything was fixed...the cab picked me up from work and dropped me off there to pick up my car...the shop is only around the corner from my house, but i can confirm the wheel misalignment is gone (it is bang on straight now)...i'll likely confirm the vibration issue tomorrow as my commute will be much longer, but i'm confident they resolved it...the two cab rides were $92.50 total (which the shop covered), so they certainly weren't looking to make any money from me, they just wanted to fix the issue.
i did ask how the alignment issue seemed to come up after the the tire change and he said it might have something to do with how the tires wear...in that, the alignment may have been off for a while, but it happens slowly over time, and the tires may wear into it...then, when you put brand new tires on the vehicle, they are not worn into that pattern so the alignment issue is noticed right away...makes sense, i guess.
in any case, everything seems to be fixed now.