Not to send negative, but I think your first issue is your group structure. Having back ups for a slower progressing 10 man almost never works.
Having capable players who casually play who can fill in from time to time is probably going to be more effective than recruiting for the bench.
Best of luck though, Muradin could use some consolidation before re-expansion. Either way, I'd just check yo self before you wreck yo self.
Thing is though, this is Muradin. One of the worst off servers for raiding currently in game. You don't just find capable players who can fill in out of nowhere...Seriously, you can need 1 dps for a end-heroic raid boss on this server and nobody will answer the call. Recruiting for the bench is the only option for us(regardless of how few people are even available) besides just transferring completely...and to be fair, isn't a capable player who is willing to fill in considered a bench anyway?