please forgive me if i tell you what you already know, i think, just like you already did 533fsb, you will have to try it first to see if the system with the existing ram kit can handle booting 550fsb and then it seems to pass memtest fine?, then there's a good chance that the system will be able to run stable at 550fsb.
but if you find that it's a little harder to do it, i would suggest you might want to first try with the Standard mode and set 5-5-5-15 and also leave tRRD-tWTR-tWR-tRFC-tRTP settings to Auto and set tRD value in bios to 11-12, then after you have a stable overclock check back to all these bios settings.
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