Op, If I could go back I would have Added a WG right when I did Egr delete (08 job1) but was more sticker shocked by that price tag & others saying "it's not needed on stock setups".. Although a WG is a lot cheaper than a HG repair job, I also believe you would benefit from spending the $ now & adding to help with everything already covered here in thread & charger upgrades come your wallet has one less part to buy..
I'm no mechanic, I have puked 5xs WOT ( canned tunes don't seem to bad on ebp, GH I see more) only doing hi way runs in my current rig (studs uninstalled currently but on shelf) trucks had coolant system pressure tested, relitive compression test & shop believes my truck runs good and nothing's wrong.. So this leads me to possible thing either heads are lifting under boost, cracked heads, stretched factory bolts??? I really don't know but this is why I've decided to add my WG. Since adding I'm dialed in somewhat & all sign are good thus far, I'm NOT saying this is a fix & might be a bandaid for the time being but defenitly adding a WG to relive drive pressure makes since to me. Good luck, hope your not confused more. Jayson