4 years on a grand cherokee is actually pretty impressive given their caliper issues and rotor warping. Back in the day I had to swap to akebono calipers to prevent warping.
Yeah, I've had a warping issue on that truck years ago (have had the truck for 10 years). We've been carrying the brand that we have for a while now so made the switch once my own vehicle was due, and have had good luck with these.
What country of origin are your rotors from, grade of steel/cast.? I was looking at some Raybestos rotors come to find out they are made overseas. Their are some high quality overseas companies and the other side of the token some really horrible ones.
I believe Taiwan. We use a company called Nakamoto for the majority of our rotors and pads
Tony