[Hummingbird Pro] OPTIMIZATION AND CASHING

I was just on Pingdom and The performance grade of my website is not as high as it use to be. A few months ago someone there noticed that I had two cache plugins and they deactivate “autoptimize” allowing Hummingbird work properly.
My web guys assistant must of activated it again. I deactivated it and then I remembered that I was told by your compony that I Gotta disable options in a cache plugin and clear its cache before deactivating it – so I reactivated it.
So now both are activated. I need help to deactivate and delete autoptimize. I also would like help with other changes we can do to mazimize the performace of my site.