I've just taken a look in bios and my ram is sitting at 1.37v@op this is a good idea. Manually change the voltage only for the ram. maybe 1.40 (this is safe). You could also bump the SOC up 0.05mv. It should be set about 1.05 IIRC. With 4 DIMM slots populated this may help.
You should be able to set XMP, save setting, reboot, then manually change voltage and save again and exit. If not just set primary timings, leave everything else on auto and set voltages as suggested.
If the extra 0.03v really matters then I guess it is something I can try out if they tell me my motherboard is fine before attempting to buy new ram/etc