I would now do an oil flush. If the pick up looked like that, then all of that crap would be stuck to oil galleries, oil drain return, crank case/block walls etc. The oil flush will help reduce (or even eliminate) any hydraulic valvetrain noise and also break up the gunk in the ring grooves to restore some compression. May also be time to think about a different engine oil? I know that some engines run small oil filters that can be swapped for larger capacity filters with the same diameter body and mounting thread. Bigger filter = more oil capacity and filtration surface. Always a bonus. Sometimes the bigger capacity filter is cheaper/easier to source too.