If you look in our species index under nagyi,- in the smaller images below in the text – I would also say it might be Kuantang, or a form like that. As far as I understand the broad band in the tail fin of the Kuantang is more white than blue, where Cherating is blue.
As there still are probably more details which should be in place in order to make a correct id, we will wait for people who are more certain than me 🙂 .. but I would say you may be right
The
PAROSPHROMENUS PROJECT
