Compromised Hosts - too many false positives?

We see many false positives in the compromised hosts list, to the point where it makes the list almost useless. Most of them seem to be legitimate web advertising that is detected as Malware CnC. The most common of these is assets.ubembed.com and <randomstring>.js.ubembed.com.

Is there some workaround to whitelist these or otherwise reduce the number of false positives?