Tips are all you can do to a common rail injector. My vote is the same as JD4440. Unlike a cummins you don't really need a super huge set of nozzles to make power. 40% over will get you enough fuel to bend rods if you have the pump to push them.
I called Jim Bower at Extrude Hone (great guy to deal with) and sent him my nozzles this week he said 45% is a good number for the stock cp3 and would suggest not going over that