They will not be fighting each other.
MIMA allows you to override the IMA. I.E. When it assist or regens and how much.
It does not allow you to give/demand more current than the system will allow in standard form
The current hack gives you 40% more current across the board, so with MIMA you would get the standard max + 40%
This is assuming of course your battery is good enough to cope with the extra current demand.
If not then the battery voltage will sag under assist and you might get a bit more power but not +40%.