My damn Brakes GROAN sooooo loud when I come to harder than average stop not a slam on the brakes stop just a little harder than normal one

My Brake setup

Stillen X drilled Front Rotors with 16k on them

Powerslot Slotted Rear Rotors with about 4k on them

EBC greens in the front with about 9k on them

stock pads in the rear with about 4k on them

Goodridge SS lines

Motul Brake fluid that was bled when I put the rear pads on

I tried using search function but to no avail bah someone help me out I think Im gonna take some sandpaper or something
or maybe it was from washing my car like a little soap sediment I dont know