maybe i should have posted this or i might not have here, but F6X and F10X use a different bootup sequence which bypasses some things which limit the samsung's speeds, The BIOS isn't meant to be a beta BIOS in line with the others, just to fix 1 or two problems. The(person who made the BIOS) already knew it would have a negative affect on some other types of memory.
The inconsistency thing is a bit odd too, like you said, a different boot up sequence works. Like if I set 2600mhz with the samsung ULV and then goto 2400 then it will fail to boot, but if i go back in and change the multiplier to 26x no issue it works. I have to clear CMOS and load a saved profile for the 24x to work, and if it doesn't then apply the settings again and it works. It seems that it is fine with booting and such unless you go into the BIOS and change a memory setting. Of course with BBSE it prob is different, but this might be good for booting with higher multipliers for screenshots and such, but this boot sequence will just be engaged when the board recognizes samsung ULV. Otherwise it wont be like this in future BIOSes for your BBSE.