The system: a style file describing how I write, six of my best past proposals as examples, and a strict rule — the model drafts, I decide. Proposals now take 45 minutes instead of half a day, and clients say they sound more like me, not less.
The style file
One page. Sentence rhythm, words I never use, how I open, how I close. Writing it was the single highest-leverage hour of my quarter.
The takeaway: Write the one-page style file — it's the highest-leverage hour of your quarter.