The only two factors you can control are stride length, how much ground you cover with one stride, and stride frequency, which is how many times you are able to push your feet off of the ground in a certain time frame.
Try not to lean forward too much while running, it messes up the mechanics of your legs and doesn't allow you to get that long stride your looking for...
Lunges are good, try some weighted ones, also, do some heel lifts on the calf machine..also, squats are good for your quad strength and giving you some explosive power.