If I set boost to 0 PSI in the target tables, I will still get around 8 PSI (assume high load/WOT) due to the wastegate, correct? Basically, it is impossible (barring changing something mechanical) to see less than 8 PSI (assuming high load/WOT/etc.) due to mechanical limitations, correct?

Thats correct.

Unless you completely disconect teh turbo from the system it's going to be making a certain amount of boost due to the mechanics of Turbo's themselves.

k, thanks for confirming. :)