You need more power & speed, and it may take a few months.
The 1st month run all steady state runs, except for an 8 x 200m hill repeats once a week. Try to average 55 miles per week.
Next month, drop down to 45 miles per week, but run 2 hill workouts a week. One workout should be 10x60m hill repeats (focusing on quick acceleration) and the other workout should be 6x400m hill repeats. You can gradually increase the lengths of the 2nd workout if your hill is long enough. Always walk or shuffle back down the hill to get completely rested on these workouts.
Month 3, drop down to 35 miles per week. Return to doing the 8x200m hill repeats once a week, and add in sprint intervals once a week. Week 1: 6x200 fast as you can go without losing form (5min recovery). Week 2: 5x300 fast again with (6-7min recovery). Week 3: 4x400 at 800m pace (8-10 recovery. Week 4: 8x200m fast (5min recovery).
Month 4, drop down to 30 miles per week. Stop running hills and switch to intervals twice a week. One sprint interval session with full recovery and one aerobic interval session with short recoveries. Take 2 days off of running per week and cross train with bicycle.
Week 1a: 4x100 cold start curves (focus on acceleration), 4x100 flying start straights (focus on efficient form) 4min rests
WK1b: 8x200m with 1min rests
WK2a: 2x200 (5min rest) 2x400 (6min rest) 2x200 (5min rest)
WK2b: 6x400m (1min rest)
WK3a: 5x400m (7min rest)
Wk3b: 8x400m (1min rest)
Wk4a: 10x200m (5min rest)
Wk4b: 8x200m (1 min rest)...need to be able to hit 26s ea. by this time.
You have to hammer the sprint workouts, but if you feel something starting to tweak, back off immediately and end the workout.