25* is about the limit out motors make power but without meth/e85 you wont have to worry about max timing.
That table looks like a good starting point. I would try to get that little spike around 5500? rpms out of it.
Get your wot afr as close as you can before adding timing. A smooth timing table will help prevent knock and help you get more in there. But you have the general idea of how to get rid of knock, when it knocks take a little timing out but still keep it smooth. Try different gas stations and what not to find the best gas. Remember to always use the same gas or better after the tune too.