[MarkFL]

Okay, try replacing what I posted above with:

.username_container a {
	font-size: 125% !important;
	font-weight: normal !important;
}

.postbitlegacy .userinfo .username_container, .postbitlegacy .userinfo .userinfo_extra {
	margin-bottom: 0 !important;
}

.postbitlegacy dl.userinfo_extra dd, .postbitlegacy dl.user_rep dd, .postbit .userinfo_extra dl dd {
	border-bottom: none !important;
}

.postbitlegacy dl.user_rep {
	margin: 0 !important;
	font-size: 12px !important;
}

As far as "tightening up," those data tags are troublesome and reducing the padding fouls up the alignment.

Perhaps later when I have more time I can come up with a solution.