All the data about LOP does not include running your turbo charger at almost red line. The LOP operational information I have seen shows the TIT running at 1600.
1600 is a normal TIT for ROP or LOP operations. If you've ever flown a Navajo or 400 series Cessna at night you see the turbo glowing through the cowling louvers.
In 20 years all Turbo damage I've seen has been a result of shaft bearing problems from impatient idiots that don't let the engine idle long enough before shut down. Most people think of this as the "cool down" when the engine actually gets warmer due to a lack of cooling air flowing over the engine. It is actually time to let the turbo spin down to a low enough RPM that it will come to a stop before the bearings go dry when the oil pressure disappears.
The TIT is a product of egt and exhaust gas pressure. All of which run lower with proper LOP operations. With proper LOP operations internal cylinder pressures are lower, temps are lower, fuel consumption is lower, engine wear is lower, speeds are lower, performance is lower.
No mater how much fuel you put through it, if you ask for 100% you'll get it for awhile. If you ask for 75% you'll get it for a reasonable amount of time & if you ask for 60% and loaf it, it will last longer.