I think, and please correct me if I'm wrong, lvl is not that importante.
The most important thing to a faction is loyalty.
Activity in the second place.
What good is a high lvl player to us when he/she runs out to another faction after a while???
Sadly enough...we can't tell in advance if some1 is loyal, we'll only find out that they are not when they leave...
I'd say recruit them as soon as posible(before they join another faction), and hope that they are loyal enough so they'll stay with us.
After that we see about activity.
Just a thought...