Are you sure you weren't just feeling the front diff locking? Under lower traction conditions such as with snow tires, if you get on the throttle in a turn enough to lose traction on the inside tire, the front diff will lock and transfer power to the outside tire. This will usually cause the steering wheel to actually get pulled into the turn and it will keep pulling into the turn until you let off the throttle or pull the wheel back to center. This is even more pronounced in a FWD car with an LSD.

The steering rack bushings can create a vague feeling and can cause the centerline to be a bit inconsistent after loading the car up in a turn. If you're still on the stockers at 90k, its definitely a good idea to change them out either way.

Thanks
-- Ed