You can manually try increasing the RAM speed in the BIOS and see if your system will pass Memtest86+ and stress testing with OCCT and P95.
Going from 1333 MHz. to 1600 Mhz. RAM speed only results in ~1% system performance increase with DDR3 RAM so there isn't much to be gained at all unless you can double the RAM speed say from 1066 MHz. to 2100+ MHz. Then you might see a few percentage points in system performance and a few FPS in games. It certainly is not worth having an unstable PC however for the small system gains.
i guess if your just tightening up the timings then put the first at 8. see if its stable, then the third to eight, if its not stable you can raise the 24 to 25 and maybe give it a small boost in voltage.