Here is something to try. Sometimes after hard braking, pads get a harder where they are creating the most heat, and need to be burnished( removal of hard spots) when riding at higher speeds lightly touch the brake for a second or 2, do it a few times. The key is to not overheat the pads, just clean them up.
Some pads hard spot easier than others. Used to race snowmobiles cross country and do some testing for Hayes brakes. After hard spotting the pads, a few brake taps on a straightaway any they were back to full strength next corner. It might do the trick.