3 wire 3 phase monitor with two or three CT's?

Hi, have Just installed my flukso v2, it's been running for about 24 hours now :

Second major question,

System is as described below, when I first setup I selected 3 phase in the sensor setup, with a reduced voltage as suggested by Bart in another post. However this yielded very high 10kw load for a consumer that I know is rated at 4kva.

When I spilt the three phases out I see approximately correct wattages per phase

This lead me to do a bit of reading around and I came across this document


Bart I would really like to get to the bottom of the correct way to measure 3 wire 3 phase systems that are prevalent in Belgium but also the USA and Japan ( apparently ). however this is beyond my limited electrical engineering and mathematical skills.

Regards Keith.

System is Belgian and setup is as follows : 3 wire 3 phase 220 v line to line voltage.

3 phase 3 wire unbalanced both single phase ( line to line ) and three phase mixed inductive and restive loads
Line to line voltage is 220v Line to earth voltage 128v

One 50A CT per phase, each recording separately at the moment, ( more of that in another post ).

Solar Inverter Segregated from consumer load measured using pulse output.

Main consumer is a 4kva single phase (line to line) heat pump,