Cadillac CTS-V - brake problems

to all the brake guru's

This started happening after I was racing someone on the freeway; got up to about 130MPH and had to slow down more than usual.

Honestly, it doesnt feel like warped rotors as I have more than 60% left in my pads and I changed the rotors along with the pads. So the things have practically 10,000-15,000 miles on them.

It doesnt do it anytime below 90MPH, but when I hit the brakes they start to vibrate. until I get to a lower speed. Like I said, below 90MPH

Could this be a brake pad issue?

All input would be great

Thanks,
Ryan

Also to add. My wheel doesnt shake or anything. It just feels like there is a vibraiton going through threw the whole car. Especially near the rear

Front pads are HPS, rear's are standard orielly's brand. I couldnt wait for another set of HPS's to be shipped to me, so I had to use those

Rotors can warp the day they're new, if they're junk rotors, and if they're subject to sudden temp change etc.

this is just a recent problem though. They are stoptech's so I expected a little more out of them.

But then again. This doesnt feel like a normal warp

Could the brake pads every cause this issue?