The fuel cut elim stuff in the MAFT is kinda crap, I wouldn't try to use without some careful tuning and monitoring.
Creeping to 19-20psi is safer than run 19-20psi from the get go though. Running 20psi at 4000rpms is much more likely to knock then having it slowly creep to 20psi at redline where you might be able to get away with it.
If you really want to cure creep, then get an external wastegate.
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