Get rid of them bananas mate, quite hard to read through your post : set TRFC to 50 or 55 and set NB voltage to 1.26 to test... but I suspect one of ya dimms is not as fit anymore as before and 1703 bios I never tested as 1406 was more than adequate for me, even 0803 was one of the better biosses for me... also there can be a variety in voltages between the boards so it might require some more or less on some settings...

For the Bios flashback see my above post with Koda's tool !