I have a 2017 gsxr1000. I had a shop install SBS street excel sintered front pads and they are gripped fairly tight on the left side without the brake lever being pulled. They state that the pistons are stuck, or do you think the pads could be too thick? looking at you guys for opinions on how to go about this thank you. They have replaced the brake fluid, cleaned the calipers and all of that but the pads seem to be sticking.