I am glad I didn't listen to those that said "go with 12-12-12". Found this the yesterday and it says right on it that it is not for established lawns like mine.
This is why getting info from the internet is so difficult. That and half of you are not listening.
Me: "I do not have time to get soil testing done"
Multiple replies after: "You really need to get soil testing done"
I ended up having to go elsewhere to get help. After I spoke with the specialist, I spoke with my neighbor (who has done soil testing). He has the best lawn in the neighborhood, and he said that the fertilizer I was recommended is perfect for what we have and my lawn.
I don't want to bash the forum, because I do like it. But in threads like this it is very frustrating to read comments after it was clear that others had either not read the thread, or paid no attention to what I had to say, or others that just didn't know (like in recommending a fertilizer that would have probably done serious damage to my lawn).