It looks like you do/run nearly the same distance every day. Have you tried a bit of variation in your distances and/or paces? I know that if I run the same distance at the same pace every day I tend to get fatigued. I think it helps to have variation in paces and distance as part of a weekly plan. I think you mix it up.
If you're 5 years removed from college you have many fast years ahead of you.
Five point plan
1. Read Once a Runner
2. Pick a race to rain for
3. Make a training schedule
4. Do an interval workout 1 or 2 times a week. You don't need to have a track just do hard for 2 minutes and jog for 1. More of a Fartlek, i guess.
5. Vary distances.
Take two and call me in the morning.
Get back to 80+ miles/week and 165 lbs.