We run a whole fleet with hydraulic brakes. We totally gave up with having rotors turned. It's faster to just put new rotors on and be done with it, more cost effective also considering the time it takes to load them up and have them shipped off for 3 or 4 days to get turned. And afterwards they would always heat crack. And the fact we are getting 80,000+ miles out of a set of front brakes.
Did you check and lube your guide pins? New calipers?
I was formally Baptistbusman. However, I lost my password, and had not updated my email address.
It's been a common problem in our area to wind up with a front end shimmy after replacing front pads with the factory rotors. I believe that it generates a lot of heat to seat the new pads in and causes warpage. Replace them with Performance Friction rotors and you will not have that problem again...even if you replace the pads down the road. Perf Friction rotors are MUCH harder to warp.