Ride,
Are the new rear brake pads you installed made of the same material that are on the fronts? Just want to make sure you aren't running semi-metallic on the rears and ceramic on the fronts. That would change your braking dynamic. Also, the rears should more or less "spin" freely with little to no resistance.
JimWilly,
There could be a few reasons for that sound and feel you are having...(do you have a V6 6-Speed, or 4 cylinder, auto or manual?)
1) You could be "re-depositing" brake pad material onto your rotors from time to time. If you make a couple of hard stops- that can heat up the rotors and pads (and fluid). If you suddenly park the car (especially with the e-brake on) you are "cooking" your pads and some pad material will stick to the rotors. This will cause the "warped rotor" feel- which is NOT actually a warped rotor.
2) Your rotors may in fact be slightly warped....it happens. Improper torquing of the wheel to the rotor hub, improper lug nut torquing sequence, throwing cold car wash water onto hot brake rotors, etc....did you check them with a run-out tool? Sometimes, at higher speeds, you don't feel the warping. Only at slower speeds do the warped rotors make themselves known.
3) Your pads may be non-symmetrical: Are they wearing at the same rate? Compare left and right sides to each other, as well as the pads on either side of the same rotor....are they similar?
As for the link above- they work very well for me. Lots of negativity about drilled and slotted rotors began 10-15 years ago when manufacturers had no real idea what the heck they were doing. They run cooler, run longer, and are zinc-plated so that there is no more rust on the hubs or cooling vanes. As long as you are not auto-crossing your car, you will be fine.
As for auto-crossing: I used to race a Dodge Stealth Twin Turbo and would go through a set of pads in 2 hours. I would also have to change the Motul 600 brake fluid. Before I could change the pads I would have to pull the wheels and let the car cool for an hour- they were that hot. One time when I was changing rotors and pads, I deliberately left the car in neutral, put on the parking brake, and let the brake pads "cook" onto the rotors. After an hour, you can clearly measure the newly "warped" rotors just from that.