Hi Brian,
I went ahead and tested the filter response using a 10 pF, 33 pF, and 68 pF load capacitor. Attached are 3 plots and the reference plot on each of the attached plots is when I'm not using a load capacitor.
It should be noted that the curves shown in the datasheets you attached have the left vertical axis identified as attenuation in dB. In reality it appears that axis has been normalized based on the peak of the response curve. In my attached plots I have not normalized the vertical axis so you can see what the true attenuation is through the filter.
Just FYI,
Don
