From what I've read... the rounded dorsal leads to female sex... also males have a larger nuchal hump... but these are never 100% ways of determining sex... hopefully a more experienced keeper can chime in
I've tried to apply the dorsal ID trait to our GGs. Only one large RTGG of 4 years old has a long and obvious point / extension. The rest are either females or unresolved yet due to age / size. Will stare at them more. Only had a few minutes so far.