Write for up to 4h/day, in the morning. (Silvia 2007: Schedule writing time in your calendar.) Aim to write for 20h/wk.
Write first, read second.
Always have projects at different stages. When you get tired or bored or stuck on one thing, switch to another.
Aim to have three papers under review at all times.
Iterate: Write separate drafts. A draft is finished when you send it to someone for feedback. With a new draft, just try to improve on the previous draft rather than aiming for perfection. Expect as many as twenty drafts.
Use page breaks to rewrite sections as if from scratch rather than editing, but borrowing from the previous draft as needed.
Use a spreadsheet to keep track of journal submissions.