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check that you're getting low side oil first. pull the filter, crank and see how quick the housing fills. if that looks good, suspect either a stuck ipr valve or hpop.
when you replaced the injector seals, you did the small ones with the snap rings at the top of the injectors, where the oil feed is, yes?
if so, what you want to do is install an air fitting to pressurize the hpo system. then duty cycle the ipr open and closed and watch your icp PID to make sure that the ipr is indeed opening and closing. if good, close the ipr and leave air line hooked up for 3 or 4 minutes and listen for any leaks in the hpo system. if no leaks are heard, pull the oil filter cap and listen for air entering the housing. if air is heard in the housing, it's backfeeding through the pump and the pump needs to be replaced.
if you don't hear any air leaks, ipr duty cycles fine, and you have low side oil volume, problem is almost certainly going to be the pump. if it is, while the pump is out, replace the icp sensor with a late unit. it's a lot easier to do now and if not leaking already, will be. the late ones never leak, fit just the same, and read the same as the early ones. if your icp sensor was leaking, replace the pigtail as well.
the richest ones are not those who have the most, but those who need the least