Refocusing on the Big One

Back to the humdrum world of training...this week's Higdon plan is:
rest, 5m, 10m, 5m, rest, 20m, cross. This is a 40-mile week.
Results:
Mon 5/8 - Rest. Got that covered. Pain from race, but no worse after than before.
Tue 5/9 - Ran 5 miles
Wed 5/10 - Ran 7.8 miles
Thu 5/11 - Ran 5 miles.
Fri 5/12 - Rest!
Sat 5/13 - Ran 20 miles in 3:23:37. Pretty slow, more than 10 minutes per mile. But it took a good 5 or 6 miles to warm up properly due to sore left calf and shin splints on right leg. Can't seem to shake these injuries.
Sun 5/14 - Rest, of course.