Hey cubby, I'm going back to your post #4 where you talk about your grass not really growing like you think it should...and I'm not knocking aerating. I personally think spring is the best time.
I realize you said you fertilize, but I would recommend getting a soil sample analysis of the NPK and PH your soil has now. I have warm season bermuda grass. I used to just throw down 13-13-13 or 10-20-10 until I had a soil sample analysis done and was told that all I needed to do was put down 46-0-0. I had plenty of P and K already in my soil, but very little N. Also, my PH was too high and I needed to acidify my soil more.
Grasses have different needs of fertilizer. I don't know what kind of grass you have...but a soil analysis will give you a great insight into what component of fertilizer you need most. And PH is very important in order for your grass to absorb the different components in fertilizer.
Anyway, you may have already had this done...but if not, do it. Aerating will still be beneficial, but I think you will get a better result if you know what your soil PH is and the fertilizer your grass really needs.