2014 Ram 3500 dually 6.7l diesel turbo performance

I have this truck with 81000 miles on it. Lately the turbo performance has been erratic. I pull a 16000 lb fifth wheel and this last trip the boost was really erratic. On one hill it was 36psi and pulled great. Then on another hill it maxed out at 20psi and struggled. The exhaust breaking is working good all the time. It has been throwing codes for a while now. P2262 and P226C. Does this sound like a failing turbo actuator? What is the opinion of City Diesel actuator? It looks and sounds pretty impressive. Thanks for any info and opinions. Bill