I do think you need to make time to run doubles. So sleep 30 minutes less per day and use that time to run.. don't be such a wimp. Reducing your daily sleep from 8 hours to 7.5 hours won't make a world of difference in your mood and energy, but those extra 30 minutes of running WILL make a difference in your performance.
However, if for whatever whacked-out reason you can only run 10ish miles per day, I'd suggest this:
1)Lots of tempo running. I'd suggest 4 tempo runs per week. 3 of which at "AT" pace and 1 at "LT" pace - which if you're currently in 14:43/30:14 shape this should be 5:20-5:30 pace for 5 to 8 miles for the AT runs and 5:00-5:10 pace for 3 to 5 miles for the LT runs. You will need to eat a high percentage of your calories as carbs to be able to do this.
2) Lots of strides, drills, and hills. Don't do much sustained anaerobic running, but improving your form, efficiency, and speed will help a lot. I'd suggest 8 x 100m strides at 800 to 1500 pace twice a week, 5 x 40m at 95% with 3 minute rests once a week (do this one BEFORE your runs so you're fresh), and maybe some strides on hills and some bounding once a week.
Try that for 6-9 months, throw in some specific training for 3-6 months, and see where you're at after the first year.