Gotta love a good upgrade! You can always tinker with the wastegate, assuming you've got the fuel to feed it.
I don't want to be critical, but please, please tell me that piece of hose is properly rated for turbo oil drain usage. Thinking "it's just a drain" and using fuel, PCV, or God forbid heater hose will cost you an engine--I assure you, there's still pressure there. You'd be shocked how effectively that return will drain your crankcase if it fails. A big-truck engine can do it in a few minutes. That's four or more times the oil capacity of your 5.9 going through a similarly-sized drain. :doh: The sneaky part is that your oil pressure won't change until the pickup runs dry. At that point, you're already toast. The stuff we use costs about $1.00 an inch. It's rated for both high temperature and oil. We used to get it from PDI but we now buy Parker hose in bulk. You aren't going to find it in stock at a parts store; try a place that makes hydraulic hoses. It must be rated for both engine oil and a minimum of 150°C (~300°F). Do not use silicone hose, which seems like the easy solution. It doesn't last in that application. Though it's rated for high temperatures, I don't think it's fond of oil that just came out of a 600°+, non-liquid-cooled CHRA.
I tell you this because I love you... and you'll hate yourself if you lose an engine over an inexpensive piece of hose. Get a long enough piece that you can double-clamp both ends of it with the clamps clocked at least 90° apart. If you mention this on a diesel board and get pooh-poohed, just ask the nay-sayers if they'll buy you a new engine in the event of a failure.