There is one very simple possible reason that's being overlooked here, and I'm surprised no one has mentioned it: Make sure the wheel lug nuts are torqued down evenly, on all 4 wheels.
And 2, re-bed the pads as others said. 10 rounds of 60mph down to 10 ~ 15mph continuous braking, without stopping. After the very last round, stop and let the brakes cool, do not engage the rear e-brakes. You'll see smoke coming from the brakes but next day, it should feel different. You should be able to find an open stretch of road to do this very late at night. That's what I do when I install new pads and rotors.
If the above 2 have been done already, then either the pads aren't sliding in and out properly on the brake hardware or the caliper isn't clamping evenly up and down. In this case, you need to take it apart and clean/change the brake hardware and re-lube the caliper slider pins. Most likely reason in this scenario being dried up slider pins, could be just 1, or both pins, causing the caliper to clamp in unevenly. This causes the pads to squeeze more either toward the top or bottom, then you get that pulsing sensation, but it is NOT a warped rotor at all. This is when you see pads wear slanted.