1) As shoe said, you need more rebounding with zone. In fact, you have less rebounding than most bad D3 teams (not being mean, but a 29 team rating in rebounding is really bad).
2) You don't have much scoring on this team. Holland can shoot and Narron is decent. But that's it.
3) Look for guys that have two clear-cut strengths (and ATH and DEF are one and the same for the purpose of this exercise). I don't think you have a single guy that fits this criteria right now.
4) Try and avoid guys like Larry Glenn and Russo. Sure, they're decently well-rounded players but they don't really serve a purpose. They can't rebound well enough to be a 4, aren't fast enough to be a 3, don't score, and Glenn's BH and P actually hurt the team. Backlund could almost be a SF once his speed gets to 50 but his 18 passing hurts a lot.
Just my two cents and hopefully something in there helps.