Hi phodara. I have spent a week using this new Bambu PETG-HF (Forest Green). It prints really great generally, lovely surface texture and I am finding that slowing it down too much when shooting for improved print quality causes issues which is slightly counter-intuitive. Also, like you finding strength, toughness and inter-layer adhesion seems much lower than std PETG. Mitigating that with an extra wall. I have tried printing at higher temperatures but did not seem to get much benefit, so have settled on 256Deg C for now.
I am however really struggling with overhangs on certain print geometry features and at angles that would normally present no problem. Its quite good value, so have ordered another x4 refills as assume I’ll eventually find a solution.