I know this is an old thread, and the OP might not be a part of the forum anymore, but if anyone else is curious as to how to get rid of seems on candles, I have found this type of ceramic/pottery tool to work the best.
I'm only answering because it seems this candle forum is getting a little bit of activity and this mya help someone.
I use this tool to remove the seems from my hurricane shells.
ETA: It would probably help if I added the actual pic of the tool. LOL