The archive import table is safe to drop if you're not using any of the imported redirected urls ... ie... For example forwarding your old vBulletin links to the current XenForo links.
As for the 2nd half of this question....
XF_IP is a toss up because there are indeed a few things which are associated with this table. Including a few add-ons which were release that may plug into it.
Empting XF_IP may yield not so desirable results. You would need to also empty XF_IP_Match with it. Key word is "empty", do not drop either of them.