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Installer possibly used too much sealant which squeezed out (inwards) into pan, dislodged and is caught in the sump pickup screen partially blocking it. DO NOT TRACK OR DRIVE HARD until you have the pan pulled to clear the blockage, sounds like you will be lucky if you haven't done any damage already.
Good Luck!
Edit: Just reread your post, I thought your problems started after the Gpan install.... at the very least I would install a oil pressure gauge in the car to keep an eye on the pressure, you may have a top end oiling issue that is starving the cam timing actuator and possibly second cam circuit but that is secondary oiling compared to your main bearings. Your motor can survive a little oil starvation to the cam control circuit, your bottom end can't. There are oil screens in at least one end of the head (left side/rear of motor) that may be blocked causing the issue.
Good Luck!
Edit: Just reread your post, I thought your problems started after the Gpan install.... at the very least I would install a oil pressure gauge in the car to keep an eye on the pressure, you may have a top end oiling issue that is starving the cam timing actuator and possibly second cam circuit but that is secondary oiling compared to your main bearings. Your motor can survive a little oil starvation to the cam control circuit, your bottom end can't. There are oil screens in at least one end of the head (left side/rear of motor) that may be blocked causing the issue.