I just put in a fresh set of Boch marines with 2,300 pop. Initial results are that they seem good and no smoke up to 75% power. Am holding back the throttle as the motor only has 500 miles on it. There is a slight belch at start-up, but am sensing that I may need new glow plugs.
Previous injectors were after aftermarket marines (did not know it at the time even though I asked for Bosch) with 1,800 pop, belched at start-up (even with new glow plugs), and only lasted ~10K miles. I almost went back to stock injectors until I learned that the last set were aftermarket marines.
In terms of the current marine injectors, when I learned that the previous set were aftermarkets, I got very specific about using Bosch (right down to the part number) and pushing the pop up to 2,300.