My understanding of the Tactical fuel management is that it schedules the fuel in such a way that it minimises stress/fatigue due to the more dynamic manoeuvring required for the tactical role, up to +3G.
In that case could the "Tactical fuel management" system be moving the fuel outboard in each wing to reduce wing bending moment when pulling G? This would not be a "trimming" system is the usual sense as the CG would not be shifting either longitudinally or laterally, but the fuel mass would move outboard to reduce bending moment in the wing.