Custom league - one match per day per GW

Hi,

I've set up a custom league with 6 teams, due to play each other 6 times in a brand new nation. This gives us 3 matches per fixture. As I'm keen to ‘attend’ every game so I can record the results, I need each game to be played on a separate day - ideally 1 Sat, 1 Sun, 1 Mon. 

I've deleted all other competitions, so only my new competition remains

Nothing in my set up appears to accomplish this. I've tried: 

• Making Tues-Fri invalid fixtures - this served to stop random games being rescheduled to Wednesday etc
• Setting up match days as Sat/Sun/Mon
• Setting matches allowed per day to 1 for Sat/Sun/Mon
• However, the game appears to override this, and schedules 1 game Saturday, then 2 games Sunday and never touches Monday. Any suggestions on how to make an apparently simple fixture schedule work?