If you notice in your pic. You're fsb:dram frequency is now 1:1. On auto it was 4:3.
So you got it set for 400 and it's running ram at 200 and fsb is adding 25mhz.
Now you either need some way to control ram timins which board won't do or some way to get it to go into new timings.
When you set it to 266 it went back to old timings you said?
That's the only thing I can think of is for you to jump it big to next set of ram timings. Try 267 or 275 and hope the ram is smart enough to go to next spd settings.
Also was thinking try it with a single module. Having 2 spd modules is a big problem.