2400kgs is not allot of fuel to have in tanks when landing at destination. The primary div airport from where I am based is only 30 miles away, and the CFP still loads 1700kgs for the trip. We also carry 30mins holding fuel at 1500ft, about another 1700kgs, so getting to destination with less than about 3500kgs would not be a good idea. Also a full go-around will cost about 800kgs.
If you are down to 2.4T, then the low pressure lights will come on with changes in attitude and acceleration/deceleration, this is to be expected. On the 757 if the centre tank is 2.3T or less at take off we leave the centre pumps off to avoid this problem at rotation. The fuel has to be counted as payload for the ZFM calculation but other than that Boeing say its fine.
At the end of the day if your not happy with the CFP fuel then load a bit more, its your arse up there, not the computers! But I would not be happy with a CFP that put us at destination in a low fuel emergency state.