@ OS Eternity - Except for a couple of incidences where that user was a bit heavy handed with the Post button and caused multiple posts at the same time, most of their bump posts were a least 10 minutes apart, which is the maximum frequency allowed on the forums for bumping.
That the bump posts were more frequent than you would have liked for your thread is something you need to take up with that user, which you have stated that you have already done.
Unfortunately, hiding his 10 pages of bump posts will not return those posts for use by your clan nor will it unmax the thread. You will need to post a new thread for your clan.