As an owner of an MavPro that is unrestricted from all parameter limits, speed is the last thing I would adjust. IMHO I say “why bother?”
Excess speed is ( Mod Removed Langage ) on batteries, and most of the ESC power delivery circuits. And you cannot really increase the speed by much anyway.
My M2 has not been modified at all, and I see no reason to change anything. The M2’s are a well working system.