First off, I'm new to tuning so I'll try my best and someone please correct me if I'm wrong about something.
1. You have a lot of knock from 5500 up. You need to add more fuel in to get your afr richer and to take care of that knock. Your timing is wack so that needs to be addressed too.
2. Get those coolant temps down.
3. Since you say you're running 23 psi, your BoostEst should read about 23 psi between 5000-5500 rpm. Since it only reads about 17 psi, that means you need to calibrate your mas better using the airflow sliders.
http://jeffgst.com/gmafcalibration1.html
4. You can play with the TPS settings to get your ThrotPos all the way to 100% (this shouldn't really make a difference anyway though).
dsmlinktpsadjustment [ECMTuning - wiki]
5. Time to start thinking about upgrading those injectors. 90% idc is pushing them a little far for comfort, and will really not be enough fuel once you get your tune dialed in.