Same problem with my Z87X-UD3H with latest beta bios F8j, tried F8h bios also.
As soon as i activate XMP profile for my Kingston memory it won't dynamically clock down and stays permanent at turbo core frequency which is 3.9 on my 4770K. If i disable the XMP profile it works as normal.
And my power plan i have set the minimum processor state at 5%. EIST and cpu c states at auto.