Ditch the remote filter setup you have a a pressure loss right there! Make sure you are using the correct oil like 15w40 dual rated diesel motor oil like shell rotella t or something close to that. The pan gasket well ditch it. I never use a gasket on that and never have. I make sure both surfaces are clean I use brake parts cleaner for this. I wipe it down one last time with a clean towel then apply a 1/4'' bead of grey RTV silicone the and make sure to circle around all the bolt holes. Then I had tighten all the bolts and torque them to 5ft pounds after 45 mins then apply final torque setting after 2 hours. It works for a leak free seal most automakers have been doing this for years as RTV has become common practice for most items.