Yes, heavily modified maps are nightmares, this is not a perfect program in any way. I have converted many things but never had any luck with those types of maps, and some seemingly simple maps like No Remorse I just couldn't get to work :\ Importing those maps are going to severely mess up your tag folder so I hope you made a backup, if not just prepare to re-import if things go wrong. I can't really give advice on those maps where EVERYTHING is custom. Start with a basic map to get the hang of it. For example try Desolate Keep. I know this works, for I have converted it. (very fun CTF 8v8 on Xbox)