Yes, try and lower it and see how it affects you. Like I said it does vary from ram to ram and board to board what that setting will do.
So you got tRead to work at 6 eh, nice!!! Here, is PCMark 05 this is what I use (But not the free version) >>>
|MG| PCMark05 1.2.0
Just so you know, here in Everest is the only test I use Everest to bench with and look at (I have never used any of the other Benchmarks in it) I just use 3DMark 06 and PCMark 05 >>>