Are you using the fan? I generally print PETG without the fan.
I am printing at 230 on my Flashforge Creator Pro and at 240 on my Prusa MK2. Just seems to be where they like it best.
What is the finish looking like? What does the finish look like? Is it shiny or more of a mat finish? PETG can be brittle when wet.
I have not had a problem with eSun PETG and I use a lot of it. I do remember someone recently had a roll that was problematic but then work fine after they dried it.