Hi Costin,
I don't think you should be limited in the number of Visits you can log with ClickDimensions, unless I'm misunderstanding. Unfortunately, I think the only way that you can filter them out is to keep adding the IP addresses as filter records. Deleting the traffic would just remove any existing Visits or Page Views generated by the Googlebot.
Please let us know if you have questions and thanks for using the forum!