A restrictor plate is a rigged setup for those who can't afford a wastegate. It isn't going to provide consistent results in the same way as a wastegate. With a wastegate you will maintain a set boost all year long in any elevation, it bleeds off excess air to maintain a set absolute pressure. Its reliable. One of the biggest factors for air output is the input. You put something in front of the blower to make it more difficult to pull air in and you're disrupting the mechanics of the blower's efficiency. There is a reason the inlet has the diameter it does.
Lets say you spin it hard and its in the 70% efficiency range of the compressor map flowing xxxcfm. You add a wastegate it bleeds off the air after its already been "converted" and more or less maintains the efficiency (less heat more useable air flow). If you restrict the airflow before its used, you upset the design of the blower. Its spinning at the rate that should be 70% efficient but since you've made the inlet opening half its size, it is less efficient and generates more heat and less air used to add volume and pressure in the cylinders. Sure, spin it three times faster at half the efficiency and its going to still make more power, you're just cutting yourself short and ruining one of the best benefits of a centri....cool IATs and high efficiency.