Your quilt it fabulous!
Since your DIL is partial to the hearts block, I would try that in the center of the quilt. Try moving two of the the blocks from the bottom row of the second pic-placing one in each of the other two columns. Seperate the blocks with 'motion' to be next to blocks that are a bit more 'quiet'. Keep moving them around and when you find a setting you think you like, take a photo and keep doing that until you get a setting you are happy with.
Don't despair. You have a good thing going.
d