engine/oil temp

Higher oil temps than coolant is common; the oil is exposed to the pistons which run hotter than the water jacket; the coolant is not. With the partially filled block, then I'd not be surprised for the pistons to be a bit hotter yet; there is just less heat transfer area backed up by the water jacket. And with the turbo having oil flowing through it, that is another very good source for oil heating.

OP, if you switch to a synthetic (after a good long break-in), you can be guaranteed to see less oil pressure variation cold to hot. It is the nature of full synthetics to have more stable viscosity; this is shown in the oil specs as an item called viscosity index. So that is another option for you.

BTW, oil temp being maintained at 200-220F due it to being measured there for viscosity has nothing to do with max or optimum oil temps. 100C is just a long time standard oil viscosity measurement temp, nothing more. Max oil temps have to do with oil oxidation, and any effects on additives like viscosity improvers which do indeed tend to break down under high temps. But synthetic oils do not need viscosity improvers.. .hence one reason for less breakdown of synthetics.