Simple way to make PVP better "world wars" have 10 man clan rosters, and the matching system pits up to 10 clans against the other up to 10 clans, divided evenly. Matching will be more fair because you can, for example, match #1 and #4 with #2 and #3 Warriors will be "teleported temporarily" into "world war " clans for the duration.
you need to put more effort into this but if you are saying what i think your saying then it is a good idea