I usually do the following:
1/2 or 1 Unit on each of my Round Robin selections all Sports when wagering those.
2 Units on Two-Team Parlays and or Two-Team Teasers in Football and Basketball.
3 Units usually on all straight wagers Sides and or Totals in all sports.
4 Units sometimes during the Playoffs, Tourneys, for the various Sports, Pro and NCAA.
5 Units only on Super Bowl, College Title Games for NCAA, and some Game 5 and or Game 7.