This is very difficult to test, but I agree the quoted elements look particularly close together under XenForo 1.x. It should be noted that line-spacing tends to be a function of font-size, although it uses the default value set by XenForo as the factor. So increasing font-size of these elements may help if you still have problems in your style. Nevertheless, to "fix" this issue, we have set a custom line-height value for the elements you mentioned as of the next release, rather than using XenForo's default spacing. This brings it closer to the appearance of these elements under XenForo 2.x, which has a higher default value, and where the elements already pass this Google test.
The differences in spacing between the rows, however, have not been changed. The difference is like a paragraph break, where thematically different material is spaced apart from thematically similar material. The number of views has nothing to do with the creator and updater. And the creator/updater is merely a summary/introduction of the Contributors which can contain up to 200 names by default. If you dislike the thematic spacing, you are free to customize the CSS for those elements.