I locked my rear twice in panic reflex and while I didn't go down I started to question using the rear for emergencies. So I went out and practiced over and over using the rear and not using it and honestly my fastest braking was using just the front. I think when I focus on just the front I'm able to get to the threshold faster.
Scary thing is I was braking so hard and so often that I actually lost braking power completely. The lever had no resistance. I thought I broke something but 10 minutes later my brakes were back. Some googling suggested the brake fluid reached its boiling point...
change your brake fluid & invest in stainless steal lines