wondermom

I need to put sashing around this but I've stretched it out in some places. Pic for reference:
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I know I've pulled too hard on pieces cut on the bias and I'll definitely be more careful in the future. This is my first quilt top so I'm learning quite a bit. You can see how some of the blocks around the edges are bowing out. My question is, is it too stretched out to add the further sashing? Do I need to redo something? How can I ensure that when I'm adding the sashing, the stretched out pieces aren't distorting how straight the sashing should be? I am having a hard time putting into words what I need to know, but thought I'd try.

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