Little history first. Recently (less than 2k miles) I replaced the oil cooler and cleaned the ERG valve and turbo at the same time. EGR system is intact and truck is stock except today I was running a basic towing tune from an older edge turner.
Truck was running fine with no trouble codes prior to trip. Pulling my camper approx. 7500lbs. Truck ran flawlessly the entire trip. Not far from home I decided to stand on it from a stop just to see what she would do. As I approached about 55mph I got either an engine stutter or turbo fart. Not sure. During the rest of the trip while at a constant speed i could let off the throttle and blip it while coasting and I’d get a huge bellow of smoke out the pipe. It also seemed to wind out a little longer accelerating from a stop the rest of the trip. Got home and checked codes P0401,P132B,P2623
I had just switched to a different app to see what boost numbers it made during my hard acceleration. Once the boost hit 20lbs it immediately went -10/11lbs.
When I cleaned the turbo the unison ring was seized to the body and body surface had right much corrosion and putting on it. I don’t know if the turbo has ever worked correctly since I have owned it.
What do the experts glean from the given information?

 

Sorry the first post was so long but wanted to give as much info as possible. FWIW, This morning it seemed to run fine. With the newly installed Scangauge, from a stop with pedal to the floor and pulling the camper 21lbs of boost was peak I was seeing. That sound typical?

 

Fwiw, towing my 9500 lb trailer last week, cruise control set at 75, when I hit a long hill i would see boost up to 30.

 

I decided to unhook the batteries and do the VGT relearn yesterday evening. After that driving home with no load I can see just over 24lbs. I'm thinking maybe it did stick or malfunction some how but all seems well currently so we will just wait and see.