If you've got a gap, how's your lightproofing? Get some weatherstripping from Home Depot or something, the wide kind, and seal that up.

Right now I"m using vinegar and baking soda cause I'm out of yeast Gotta take my lazy behind to the store. Oh, and I'm using Schultz also, 10-52-10. You'll be fine. Just watch your N. You only use a quarter tsp. per gallon of that stuff anyway.