Are you planning on doing any more aerobic workouts? Seems like you've made a complete jump to mid distance workouts with still 7 weeks to go in your "pre-season" before jumping into race season.
Plans I've seen on here usually incorporate more aerobic type workouts and lots of short strides. You've basically ditched all of this. Just from lookign at your last week of training, I worry you are going to lose endurance. I just glanced at your last week of training but nothing strikes me as particullary endurance building or endurance maintenance. Also are you doing any strides after your EZ days?
I posted an excerpt from a mid-d training plan below. It's a big garbled, but the jist of it is one workout a week that is similar to the stuff you did in the fall, but possible shorter repeats. The key would be keeping the rests short.
The second workout could be what you did Friday or Tuesday. Both of those workouts are basically training the same system. Jack Daniels had said (or people on here have said, he said) that during the pre-season phase mid-d runners likely benefit from one staple workout a week. For some this is shorter "I" paced type repeats and for others its longer "T" paced repeats. I'm assuming you're probably the former type, so these 800s or 600s are good for you.
POSSIBLE WINTER TRAINING
(January-February-March)
Monday: stretching
6-8-10 miles (on hills if possible) stretching 4X150(1/2-3/4 speed); 4X 110 (1/2-% speed)
Tuesday:
2-4 mile run, stretching, interval training: repeat miles (2-3), half miles (4-6), 440's(8-12)
slower than race pace; little rest between reps , or 6 mile run stretching plus 1 mile 55 in-out sprints 1 mile warmdown
Wednesday:
6-7-8 miles Fartlek
First 2 miles easy; next 3-4 mile Fartlek;
next 2 miles easy stretching plus 1 X 880 in-out 55 yard sprints
Thursday:
8-10 mile run
stretching . 4-6X150's
4-6X110's
Friday:
Fartlek run 6-8 miles (on hills if possible)
Saturday:
Distance run plus stretching
4-6 X 110 plus 1 X 880 in-out sprints
Sunday:
10-12 mile run
Read more:
http://www.letsrun.com/forum/flat_read.php?board=1&thread=380029&id=3077451#ixzz2m8ki8CVL