I've seen the evidence that the hard OS limit will not let you get to 4000. It is a rather abrupt wall according to the datalogs.

We have a solution to high rpms via modifying the file outside EFI, just was curious if it was done another way IN EFI. And if it held full mm3 all the way out with current mapped params. I've seen a taper in fuel qty usually around 3000-3200 without intervention.