When looking at the pattern and the fabrics you have, which I think are beautiful, I do not see a very large scale pattern in the mix. If you look at the pattern it's self there is a very large scale fabric. I wonder if that is why you are unsettled with it. Just a thought.
If you have ample fabric you may want to cut out a small sample with the diamonds and glue stick them on to a sample card to give your eyes an example. I'm so visual that I usually have to do that to wrap my head around it.
I look forward to seeing this beauty come to life - I love 2 color quilts.