DM-I ran my recovery runs using a heart rate monitor keeping it below 75% of max heart rate. This works out for me to be about 8.30 min mile pace average, my MP pace on race day was 6.56 m/min. (Dam! Still Pi$$es me off.)
I never followed the P&D taper as it looked too many miles to me, but what do I know. I did move away from the program the last couple of weeks due to a few niggles I had picked up.
It will be interesting to see how you get on following the full taper, if you are, as you've religiously followed the whole programme so far.