Question DDR4 High Frequency but High RFC Timing ?

[Maikurosofuto]

So, here I am again. Going straight to the point: I was able to make a 100% stable OC after days of testing, the day I bought RAM, which is a few months ago. Everything is ok, but one thing that has been bothering me since the day I managed to do such an OC is the RFC timing, which even in the XMP profile is relatively HIGH, even though OC i was not able to lower the value, so my question is, there is some way of manage to lower this value without increasing the voltage too much, or, keeping in mind the other timing, is it better to leave it at that?

If I'm not mistaken, they are Micron B-Die chips.
S/N: CMK32GX4M2D3600C18