[Smush Pro] Smushit cdn not serving all in nextgen

Hi, I am using smushit pro and I think I turned on everything. Google stills says I am losing 1.25 seconds to not having next gen formats. It seems the smushit twing cdn is still serving a lot of the images to google in jpeg/png. How can I improve this. If I were to believe google, fixing this would cut my site load in half. Thanks.