It's very common that you have to tweak EQ to get the sound right in the main outputs, but then you mess up the monitor output (using a guitar cabinet) and also the other way around.
What I would like the have is a separate Graphic EQ for main and monitor outputs that could be store by preset.
I know you have separate EQs for main and monitor in the output settings, but they are global and address a different situation.
I understand that probably there is no processing power remaining for more simultaneous efx.
In that case, my suggestion would be allow different routings in X block in order to select in which outputs (main and/or monitor) they will affect. So I could put X block with a Graphic EQ in the main or monitor output only.