This answer suggests that if a payload were simply bulk propellant, such as LH2 and LOX, and not delicate technology such as an interplanetary probe or communications satellite, then there may be some re-optimization of launch trajectory and perhaps the launch vehicle, to incorporate such things as a higher g-force trajectory.
I know that early in a launch, the thrust (and therefore g-force) is sometimes even reduced so that the total compression forces on the rocket body (rocket thrust pushing up at one end, aerodynamic drag pushing down at the other) is capped at "Max-Q" - see also here - so how much could it actually be increased?
Question: How would a bulk payload like fuel (instead of delicate technology) change boost to LEO optimization?