Just ordered a bag of summer stress blend from Yard Mastery (by Sunniland). Looks like it is 7-0-20. Does anyone has any experience with it? Thus far i've been spoon feeding my st aug every couple of weeks at 2-3/lbs rate with XGN 8-1-8 with really good results, Although it's getting pretty hot our here in Houston area so I wonder if extra K wold help (really seeing some heat stress in certain areas of the lawn).