Indianajoinz,
A big part of your problem is your bigs. They have low ATH and low DEF. That is going to kill you all day long, no matter what defense you run.
I've been running zone for a lot of seasons with a fair amount of success. Here is a very simplistic way of looking at it: you need your starting 5 to average out to being good ATH, good SPD, good DEF. At D3, if your starting 5 averages out to 60+ ATH, 60+ SPD, 60+ DEF with B+ or better IQ, you will be a very competitive team. You only have 1 player with 60+ ATH -- Wardlaw. That's way too low.
People have this idea that zone allows them to get away with bad defenders. That's wrong. You can't have 5 bad defenders (or 4 or 3 or probably 2 bad defenders) playing together. The flexibility of zone is that you can take a lower DEF in a player, so long as you can average it out with someone bringing higher DEF. For example, lets say you find a SG who will max out at 40 DEF, but he will be at 95+ PER with 70+ SPD and 50+ ATH. He is probably too much of a defensive liability for a man or press team to use him as a starter -- they would probably have to use him for bench points. You can recruit him and start him, so long as you have a 80+ DEF playing along side him to average out his DEF weakness.
When recruiting and analyzing players, if you are considering recruiting a player with low ATH, low SPD or low DEF (especially the last one), ask yourself, "Where on my roster am I going to make up for that?"