I agree with HC, if you are comfortable at a faster pace - go with it. You can then adjust the calendar and pace schedule accordingly. The plans RW (and others) put out are intended as guides, not hard and fast rules, so use your performance as the indication of where you are training-wise.
BTW: Whoohooo! on 6 miles and the 1 hour mark. I remember quite clearly looking down at my watch and realizing I had run for more than an hour - it was quite a milestone for me