Having trouble getting the right pad to work for trackdays on a SPF with Wilwood Superlight 4R calipers. BP20's I've cooked even with 600 degree fluid and front ducts. Bias took a bit of adjustment, but seems OK now. B pads grab nicely, but can't eliminate severe squeal and vibration. I've done all the usual tips to eliminate pad residue from sanding them to having rotors resurfaced. Front runout is .004" both sides. My Lotus Europa also runs B pads which work great for trackdays. Those rotors also have .004" runout and had some initial vibration, but cleaned up quickly. Is there a pad between BP20 and B or other trackday recommendations?