I have no knowledge of the CDIS, but if you are looking at the actual engine temperature, at the engine outflow, then
@Andrew is right, monitoring it will only keep you awake at night, and around110C is perfectly normal for an FSI, unless the engine is under significant and continuous load.
The way to check if all is well, is to log engine temperature, coolant temperature, and engine load, over a varied drive.
As long as the drive includes a cruise at 70 ish, to check if the lower engine temperature is activated, as it should.
Tinkering with the engine temperatures is not a good idea, (imo). At best mpg will decrease, (if the engine doesn't reach expected temperature, the mixture will be kept rich).
If you really want to run the engine at a lower temperature, then go with ProBoost.
The FSI was designed to run at a higher temperature, for good reason, and yours, Andrew's and mine, have been doing so quite happily for nearly 20 years.
Mac.