Two that I can think of right now.......
1...(I haven't tested this) Try a GEQ block placed before the Amp block with the a few of the lower bands tapered off to reduce the level of the low-end interring the Amp, then add some back after the Amp if desired?
2...(My preferred and tested method) Add a modifier to the 'Input Drive' (affects tone) or 'Input Trim' (doesn't affect tone) and set the source to 'Pitch'. Set the 'Minimum' to the desired gain level for the low notes. Set the 'Maximum' to the desired gain level for the higher notes. Play with the 'Mid', 'Slope', 'Scale', and 'Offset' to get the gain to track the notes to give you the extra gain that you want, where you want it as you play higher notes.
Number 2 works great once you get the modifier curve right. Sort of like an automatic 'Rhythm' to 'Lead' switch. This same "Pitch controlled modifier' method has a lot of other uses. I use it quite a bit to automatically control other effects like Harmonies, Chorus, and Delays, etc... Cross fading gradually or suddenly (at a very specific note) between two different IR's, two different Amps, or two completely different signal chains.
I have posted several wishes for some enhancements to the 'Modifiers' to make this type of thing even more powerful.