rather than spray starting fluid (which can/will burn holes in aluminum pistons [personal experience]), I would use carb cleaner spray.
to properly adjust a manual carb, a vacuum gauge is needed.
back when i worked nights (7-11pm start/5-11amfinish); I kept the same sleep cycle on my days off, had a 'light' meal (scrambled egg or cheese samich) before going to bed, would get up after 5-6 hrs, then take a 3hr nap before work.