To prevent it from happening, you should always press towords the darker fabric. But when that isn't impossible, you can trim a scant 1/8 inch, or less, off of the darker fabric. This will narrow the seam allowance and it will be hidden behind the lighter fabric once it is pressed.
A close-up of the marks for the quilting. Please excuse my pins and stabilizing stitches. I use these stitches to keep the seams from moving. I hate it once the quilt-top is ready to be quilted, when a seam allowance has flipped over. I had initally wanted to machine-quilt this. But I'm not ready to do all these curvy, feathery wreaths quite yet. I think I will have to hand-quilt it to achieve the vision that I have.
p.s. I hate calling it my "drunkard's" path quilt. I know that it's the blocks official name but I'm going to have to think of another name.