Have you tried loosening the lacing on the back of the white dress? It looks like it's pulling, which might cause some of the bunching in the front.
I think the blouse looks cute with it!
I have a dress from Fan Plus Friend that has that same weird buttoned waist ties. The only thing I can really think of to fix it is to take off the loop and put in some actual buttonholes.
This is how I tie my bows: http://www.sweetrococo.com/documents...ngle?locale=en
it works well for both single-sided and double-sided waist ties :3
I don't think the red dress is too short on you, but it might be a good idea to shorten the sleeves.
You look super cute in both dresses by the way!