First of all, hello and welcome to ForgeHub!
To save you the trouble of dealing with harpies, let me tell you that you've gotta have pictures of your map(s) in your thread (PM me once you've got them so I can remove this bad stigma-thing from here and let you have your maps in peace). You should also probably take a look at
this while you're at it.
In any case, it sounds like you've got a promising gametype set up. My one critique of it would be to get rid of spawn invulnerability. While spawn camping can be an issue, if you've got enough spawn points, you generally don't have to worry about it. Experienced players can also rain hell upon their opponents with those three seconds of invulnerability, regardless of where they're spawned.
As for the maps, are they simply the default maps with weapons modified, or did you modify other parts of them?
EDIT: Oh, and I'm not sure, but you may want to consider asking a moderator to move this to the minigames forum, because I think it might just do better there. ^_^