If they rise more than the std one yes they will give more fuel, but as the chips, especially aftermarket ones are adjusted to 12:1 where max power is the power will go DOWN, mix will get richer, you will start wasting fuel, wash the bores of oil etc.
The std one is there for a reason, it is a known pressure so the chip is written with this in mind, if you now up the pressure the width of the injector signal is the same, so the above happens.
tabetha