Welcome, Tony.
I take it that you are using the three-phase sketch - is that correct? From the look of the picture, I strongly suspect that isn’t the case. If you’re not using the 3-phase sketch, the emonTx will never read anywhere near the correct powers because of the phase relationship of the three lines.
Now if you’re using the latest version of the 3-phase sketch, the “definitive resource” you are looking for is the pdf file that came with the sketch. You can now allocate the c.t. to any phase. You could not do that with the earlier sketch. But the reference phase remains the line that the a.c. adapter is monitoring. If for simplicity you use the default setting, then your setup is correct.
The 3-phase sketch is here: Update to 3-Phase PLL sketch - #5 by Robert.Wall