Exactly what troubles? Got data and links to show how the filter actually effected the oil pressure? You know exactly where the oil pressure sensor is located on that engine? Which oil filters caused the problems? ... if they were the "wrong" one, then maybe there's more to the story than what I said about using many different filter brands that were specified for my engine and none of them changed the oil pressure vs RPM curve while the oil was at the same temperature.lol. you can always tell who the arm chair engineers are. tell that to the all the people who had trouble with their trucks because they had the wrong oil filter in their 6 liters.
The tests I did showed zero oil pressure differences. And if you knew how a normal oiling system works, you would know that if the oil pump isn't in relief then the oil flow is the same going to the engine regardless of the filter.
Maybe the oil pumps are junk in those engines - too much slip and/or a faulty pressure relief valve.