Does this close to the layout you want ?
If you want the layout like in the picture.
1. Use css editor adjust width first. Default is 82.125%. You can change it more than 100% but I think it harder for align.
2. I think you should remove print button, may be Email button too. I don't think someone will print. Goole Plus button should be in same line now.
3. Now adjust the margin for move button set to center. I adjust the second one (Right margin), from 0px to 20px.
4. Play and Test :D
CSS File that you need is sharing.css, should be line 121.
Hope this can help, Sorry for my english :D