well, Im at an early age, im not very experienced, but Ive read alot of this stuff. I really dont mean to throw you off or anyone.
What Ive gotten from sexing.
Male: Ball and stick. Spades playing cards blah blah blah. A ball, on TOP of a stick. That is what I think of males. At an early age, I dont believe it would be a CLUSTER. I think it would start as one lil stick with the ball more resembling the preflower stage of sexing. What Im trying to say is that the clusters form later, but in preflower and before production I believe in my own thoughts thats its a ball on a stick.
Female: A triangle shape. NOT a ball on a stick. Not much resemblance of a ball, but more of a pyramid shape, a triangle. Larger diameter attached on the node at the bottom than at the top. more spherical shaped.
Do you have a macro mode on your camera?
See how close you can get into it.
In preflower stage its pretty hard to see with the naked eye. But it WILL show, you WILL have some time to chop males diligently.
Heres a pic of mine, preflowers kinda showing in more of a triangle shape.......