On a forum there is a post that the differnce by probing is only 2 to 3 caudals.

I have not read this. From what I have heard the probe either stops right away or goes very deep into the tail area. And one of these snakes that probed very deep turned out to be a female so I would not trust it.

I have also read about counting the length in percent? Males have a longer tale?

I think I read this same post. I believe the males had tails that had 10% to 20% more subcaudals.

Maybe I start here a Thread where I POST MY iNFORMATIONS about my two snakes.

Please do. I'll do the same.
-----
Currently keeping:

6.10 Gonyosoma oxycephalum (Javan, mixed colors)

0.0.4 Rhynchophis boulengeri

1.1 Philodryas baroni

1.1 Lampropeltis triangulum multistriata

0.0.1 Rhamphiophis rubropunctatus

0.0.2 Morelia viridis (Aru & Merauke locale types)

1.0 Rhodesian Ridgeback