“Getting into the weeds” is a confusing metaphor. I think of a search for something lost, like a golf ball.
But folks use the phrase to mean looking at details. http://www.word-detective.com/2011/05/getting-into-the-weeds/. If so, “getting into the capillaries” (an old metaphor used by tax policy folks thinking through details) would be clearer. Weeds are all bad; capillaries require careful, detailed, individual attention. Some capillaries are working well, some need fixing, and some are beyond fixing — like different parts of a statutory draft. Maybe capillaries is too big a word these days. See http://www.languagemonitor.com/about/news/obamas-acceptance-speech-at-9th-grade-level/