Here are my suggestions:
- Have a plan before you start, ideally some form of wireframes or mockups that have been agreed upon and are well thought out. This limits the time people spend on the actual document.
- That sounds silly, but assign timeslots, e.g. On Monday, Mike will get the header, pages, and layouts in, on Tuesday, Kevin will hook up the data, lists, search and filter. Once this is done, Mike can go in and adjust colors, alignments, dimensions and refine; Once that's done, Kevin will work on mobile responsiveness
- Clone the experience, work in parallel, the take the best pieces (or whatever we were able to figure out) back into master copy. This is either a replica of the work or using copy paste of the json in ago-assistant