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If no gains are seen with the tune then the problem is the person doing the tuning does not really know how to tune or does not understand how
the newer functions like DOD, VCT or DI work
VCT alone has many settings and tables, some shown below.
Consider a C5 Corvette for the engine and auto trannie had a total of 512 K bytes flash memory total in the PCM where calibration resides
and a C7 just for the engine is around 2 meg bytes shows how much more complex tuning is and you cannot use the same tuning
methods on the LT1 then used with LSx powertrains