The late summer bite has always been the hardest for me. I was going to suggest you go smaller, but it looks like you have already tried that. I am a fan of bobby garland skirts. I hate them, and love them at the same time. You can normally only catch 2 fish before you have to replace it... I would say stick with it and good luck. I hope it gets better for you. I fish KY lake and I have had the same problem lately.