I rarely press my seams open. It seems when you do that, you can actually see your stitching. I've watched other quilters do that and have seen their seams when looking at their quilts. I highly recommend pressing one way or the other.
Do you press from the bottom or top? I always press from top. You can keep your pieces from stretching in any way when you press on top.
I try to press to the darkest but if thats not the way my fabric wants to go, I will press the way it needs to go. I hope that makes sense!!!!!LOL
I quilt about 14 hours every day, so its just kind of automatic to me!!!
Tricia