The Deye CTs are horribly inaccurate.
You can improve that accuracy by using an external meter, but there are only a few that work with the Deye (check your manual), doing this certainly improves the zero-export accuracy. This meter (not cheap) definitely works with the Deye
https://www.lazada.co.th/products/i4470648921-s18041805611.html?
We also have a number of Hiking DS238-2 energy meters monitoring various stuff. These have RS-485 for remote reading, sadly they don't talk to the inverters.
In reality, the only meter that actually matters is the PEA one, the others are purely an estimate unless they are calibrated and certified.