Bigger nozzle or higher pressure (not tdi comon rail)

Hi
I own a toyota Vigo 3 liter D4D(nipon denso comon rail) here in Thailand.

I would like to ask you guy what would be the best bigger nozzle or piggyback to increase the fuel injection pressure?

I already have a piggy back with a dash monitor where I can adjust the following:

length of injection 0 up to +37%
Start point of injection 0 up to 25% earlier than OEM
Turbo boost. I have now 0,7 bar more through all the boost map so 1bar at 1700 t/mn 1,7 bar@2500mn and 1 bar@ 4400 rpm when injection decrease

I also have free flowing exhaust.

If i can find and go to upgrade nozzle how much flow increase should I get considering that I have +0,7 bar boost?

Thanks

I wouldnt increase the Pressure. The common rail system gets very unreliable at over normal PSI. The best thing to do would be bigger nozzles, but i dont know who does those for your engine. Send a PM to Kerma, his name is Charlie. He gets great nozzles.

thank's Des
I already have send him part number from Nippo Denso
Waiting for an answer