I have a few theories on these measurements.
1) Gain and level can be found to have an equilibrium using a graphing calculator equation leading to better harmonics.
2) MAX Power can be calculated somehow, and I believe that an industry specific regarding this is +3DB. However I am completely unsure.
3) If anybody else has any theories in this regard of dialing in these basic equations using a ti-84 please comment, I only have these two theories.