I really hate that it appears I'm attacking this saddle. I am not I think other people will probably find it the most comfortable saddle they have ever sat it. Build quality is outstanding and you won't find better people to deal with. For me however I think that it boils down to the overall size of the Flex providing a much larger area to distribute the weight into. I wont say pinch but pressure especially in the triangle open area just before the 2 panels come together. I did play with panel opening width and bridge length. Like I said before I could hunt out of this saddle without issues I just find my Flex more comfortable.
Out of curiosity, what sizes are your two saddles?