I think you are focusing on overall rating too much. You have only 1 guy over 80 def, 0 guys with 70 ath, and 0 guys with 80+ spd.
Your whole team is pretty weak ath/spd/def. I think you can sacrifice ath/spd/def more in big men while having 90+ reb//sb/lp, but your guards really suffer 50 ath 70 spd is a decent D2/3 guy but pretty bad D1, I think you need to aim more towards either 70/70 ath/spd or 40/50 ath but 90+ spd. Their bh/pas is not strong enough to make up for that,