You may occasionally get a bump when you split mirror and merge even if all the central points merege ok due to the various tensions on the edges - this usually happens if your mesh isn't distributed evenly. If this happens, depending on your mesh, you can bandglue the sets of polys on either side of the centre and this will get rid of any bump created - be careful though as you need to make sure that bandglue will work the way you expect it to...
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