i recommend you not even go with the fuel regulator, run stock fuel pressure, and run bigger injectors if your running out of fuel, IMO, if your increasing fuel rail pressure to make up for lack of fuel, then your injectors are too close to 100% duty cycle anyways, and again in that case its a safer option to go with bigger injectors, if you want to be safe, which you say you do
pushing the injectors too hard will increase the chance of something going wrong, your spray patterns are also affected when you push the pressure too high