I have about 30k sqft of LESCO Double. Eagle perennial dwarf rye grass over seeding Bermuda in loamy sand. Been figuring about 1lb/sqft per month of nitrogen, but switching from quick release to Lesco's 28-3-10 w/ 50% slow release. At 1lb/1k sqft per month I'd need ~9x 50lb bags. Does that sound right for winter rye in North Texas 30-50 degree temps?