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Things that would reduce page weight more, but that I don't recommend, would include not closing paragraph tags, running the markup together on a single line, or anything else that either will not validate or makes your markup too difficult to read when you need to change the page.
I know what you mean about keeping the <head> clean though. By the time you have meta tags, stylesheets, javascripts, <link> tags, and whatever else, the head can get pretty long. I keep it as lean as possible without sacrificing too much functionality. If my pages do okay at the websiteoptimization.com speed test, I'm satisfied. Normally my stylesheets, javascript and content only take about 15kb, so I don't mind if images come in a little later.