Duramax Issue

Let's see if I can answer all the questions. First, I do not have an auxiliary tank, but I do have a Titan OEM replacement tank that holds 55 gallons. This tank was installed a couple of years ago and I have driven probably 35K miles with this tank and never had this problem. Second, the first dealer I took the truck to in Missoula, MT said "low fuel pressure commanded pressure to 26000 psi held pressure. checked vacuum to supply side and it was 2 inches with specs. everything is testing good at this time." The service writer and the technician told me to keep erasing the P0087 code with my OBD II scanner and keep driving. The second dealer I took the truck to (this time in Idaho Falls, ID) ran "injector return enhanced. Return flow on injectors 2-8 had return rates above 18 ML and need to be replaced." There was no other dealer in Idaho Falls for a second opinion. Third, since the injectors were replaced, I have driven approx 6,000 miles through Idaho, Utah, Colorado, New Mexico, Arizona, Utah (again), Nevada, and now in Southern California mostly with my 5th wheel camper in tow. The problem has not occurred again. Fourth, I have always used OEM fuel filters and changed them at the recommended 15k mile intervals. Is there a better filter than the OEM? How do you improve the filtering? Fifth, Killerbee stated, " There is a TECH BULLETIN on this specific issue, and if it was never brought to your attention, and eliminated as a cause, then you have proveable legal recourse." Such a TECH BULLETIN was never brought to my attention by any dealer. So what's the suggested recourse path? Sixth, majorgator, by erasing the P0087 code with my OBD II scanner (that I left plugged in) the engine would immediately go back to full power and the check engine light would go off. Thanks again.