Fertilizing distressed St Augustine

With some help, I have concluded that I seriously goofed by applying Weed B' Gone to my St Augustine grass. The sections that I sprayed heavily are in bad shape. In addition to the Weed B' Gone application in February, I applied Scott's Bonus S Weed/Feed on March 22, 2004.
The resulting lawn quagmire is:
1. some sections greening up very nicely (not too much Weed B' Gone sprayed there) 2. some sections pretty bare with only some green runners visible - all of the grass blades fell off. 3. some sections look completely dead.
I was advised to fertilize/water heavily (not with Weed/Feed though) to see if I can resurrect the lawn, but I am hesitant to add fuel to the fire. Could anyone else recommend a course of action? Location is Houston, TX.
Thanks!
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Tom Harris wrote:

Don't apply more than 2 lbs. of nitrogen per 1,000 square feet per year or you will soon find out what St. Augustine decline is.
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