I have a L83 also and your engine is wearing normal compared to my numbers, high silicone and high copper, mine even had 3ppm lead. Nothing super concerning your always going to have higher iron ppm then most people around here having GM v8. Looks like my engine for most part nice.
16 Silverado 2500 6.6 Dmax
15w-40 Chevron Delo SDE
Frantz bypass /w AC Delco pf2232