Right that is progress at least. XMP profile is what your ram are rated for and specced for. So at least we know you did get what you paid for. And further that your ram are not defective.
Moving on.
If the RAM is able to pass memtest at the XMP profile but fails when you attempt to tighten the ram timings, then the logical conclusion is that your Corsair ram cannot operate at those tightened latencies at the voltages you have used.
Not all products are the same, even when they are the same models. It just might be that you have ram that will not clock. I suspect that it is possible one stick that will not clock. Run memtest one stick at a time with the tighter timings and see if any of the sticks are able to pass.
If no - then sadly it does seem your ram will not clock as you had hoped.
To help us help you - please provide as much information about your system and the problem as possible.
