Review on Godox TT685N TTL Camera Flash for Nikon DSLR - High Speed 1/8000s, GN60, I-TTL II Autoflash Compatible by Deep Echemendia

I just received my 2 cameras and both are underexposed by about -1.3 with iTTL compared to my Nikon Speedlights (SB600 and SB400). I am very disappointed with the performance of the Godox TT685. My tests so far have been done with the flash on the camera. I would be happy with performance similar to Nikon's or even -1/3 underexposure. The manual setting seems to work fine, but I want to get good performance with iTTL as advertised. I also bought an XPProN radio trigger which I haven't tested yet. Hope its performance is better than TT685.