I grew up in Lima. Used to be a pretty good scene there 10 years ago or so, we even had an indoor in the (now demolished) American Mall for a couple years. All the shops closed though and in turn all the competitive teams around there broke up.
As has been mentioned, Paintball Plex over in Ft. Wayne is probably your best bet. I don't know anything about Swampballz. Xcape is a bit of a drive since it's on the southside of Columbus, but there is always some good paintball being played there. On the other hand I doubt Blastzone would be worth the drive for you (just north of Cincy).