Here's my idea-I've got 3 50's under my belt so far and this is what I did for my taper before my first one last year (I did 2 six weeks apart)
Seeing all those 4 milers next week looked boring. On the shorter runs keep up some intensity.
Everyone is different, do what feels right for you. Make note of how you feel before and after and learn from it for the next one-maybe it's too much or not enough.
Recently certified RRCA Running Coach
will the following be too much of a taper (or possibly not enough)