History of my lawn. Last year my yard started getting little round dead spots that got bigger (St. Aug). Now the major part of my front yard is dead. I took a soil sample and sent it to Clemson U. The results were chinch bugs and some sort of fungus. So I treated with some stuff from lowes. (didn't't help) it kept dying. So this year Scotts came out and he said that we didn't't have chinch in this area (Easley SC about 4 hrs from the coast). And proceeded to tell me I killed it by cutting it to close I cut at 3.5 in. So i agreed to let him treat it. But now my grass is starting to do it all over again. So do I trust my U. or scotts? Any suggestions on how to fix?