For reference, here's another link to my conversion chart:
P7N Diamond BIOS Translation Chart
25 for FSB Term in the old BIOS is about ~1.245v. 65 for CPU GTL in the old BIOS is about .8504v at that FSB term voltage. At your new setting of 1.3125v for FSB Term, the CPU GTL goes up to 0.8968v at its same setting, so that one is correct.
I've been testing 1.2b2 for a while now, not too many problems with it...or at least nothing I haven't had in other revisions. I never had cold boot issues per se, but I have certainly had no POST issues where I had to clear CMOS - whenever I change any hardware around it does that (anything from reseating RAM to changing a card's slot, USB front panel connectors, etc.). I only do that stuff unplugged but get this - when I replaced my PSU, it booted just fine afterward, so it's definitely something to do with the board's detection of configuration. I'm not sure if that helps you at all, but my symptoms lead me to believe that a more chronic form of cold boot issues is likely due to how the board was flashed and cleared on the BIOS update.