You should stop worrying. I know that another site consistently harps on matching CTs to their full range, and disavows accuracy at the low end. That has not been my experience with IoTaWatt.
I just grabbed a couple of LED bulbs labelled 10W and screwed them into a test jig with an ECOL09, HWCT004, ECS1050 and the ubiquitous SCT013-000.
With one bulb, they all say 10W and occasionally one will go to 11W briefly.
With 2 bulbs they all are a solid 21W.
The CTs have been the goat for poor low end performance of some other monitors. I would maintain that it’s more likely their 10bit ADCs and low sample rates. In any event, no problem with any decent 50A CT at the low end with IoTaWatt.
IMO the YHDC SCT006 that is sold elsewhere is junk, and the only advantage is low price. I don’t carry them. Echun has a 20A split-core CT and it’s just as bad. I don’t carry that either. You can’t go wrong with the ECOL09 or the ECS1050.