The Empire has the best hauling ship in the game, better than the Federation's by 794 to 618 so they are always going to have an edge in these CGs.
Just take the right ship for the task.
As much fun it is to fly a Corvette, in this case using a T-9 is more effective. Mine has 740t cargo space, jumps empty 40 ly and fully loaded 20-something (with shields and guardian FSD booster) - and has a rebuy of 5 Mcr (aka dirty cheap).
If the imperials really are going to overtake the feds in this CG, it is because they hauled more and not because they have the better ships.
Whoever "wins" this CG, the result will be a very strong presence of imperial, federal and alliance forces in the Witch Head nebula. (The Alliance guys and gals are doing a nice job indeed to haul the required commodities 160kls to the station).
Everybody will win.