Strength is going to be more important in the long run if you are trying to prepare yourself for football. You can continue to lift m/w/f and run Monday to Thursday. This will give you the weekend to do whatever you want, which sounds like it already works our perfectly. It's not that big of a deal.
You should care less about your track coaches opinion of you lifting for football. Instead worry more about busting your ass in the gym, on the track, and most importantly in the kitchen. Eat all the shit you can get your hands on and more. You won't grow stronger if all you do is lift and run. Eat dense foods like oatmeal and raisins, peanut butter, ground beef, cheese, sweet potatoes, dried fruit, whole milk, rice with butter, eggs, protein powder. Try to put on at least 20 pounds to your frame.
All these foods are not only calorie dense, but are also pretty cheap if you're worrying about costs. Lift big, eat big.
Edit: I forgot chicken