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This is a tough one without seeing it. Have you checked your a/c turn it off while driving is you have not already to see if it changes it. They kick out at wot throttle but if the bearings or clutches are in a bind maybe it cannot. Also tensioner pulley. See if the spring is tight, pulley spins freely but not loose? If its not that maybe a timing chain issue. Would be my next thought because of chewing the belt up. However, if the belt was bad and you just didn't find out till it was too late maybe that was the full issue.

These turbos are known to crack the seal face on the waste gate. Which would definitely give poor performance and may not throw a code initially, but the belt issue is weird.
 
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