Well in short I bought DDR3 2000 to run at the full 2000 and from what you're saying is that no setup currently supports up to the full 2000. I can get it to boot 1:1 ratio but that is only running 667Mhz(333) about 1300Mhz shy of the advertised speed. The guide on TH is vague it says nothing about RAM speed really.
Question: you can't get stability when RAM exceeds that of a 1:1 ratio? BS why do they even sell higher speed RAM then.
To answer your EPP question: the 'profiles' or varibles are disabled, auto, and expert. Both expert and auto will yield the same variants in FSB and unlinked or linked ratios and speeds, however the disabled option only doesn't dynamically adjust RAM timings which is irrelevant to the issue.
P.S. the default value is 2000Mhz because the RAM is DDR3 2000 so no over clocking is done but you say ove rclocking is having a higher RAM speed than the FSB.