Your welcome.
When setting the amount of your flat bet at the beginning of the season I only set this amount at 1% of my starting bankroll. That means I am comfortable betting in the knowledge that I am not risking a large amount of my bankroll when the season starts.
As long as you continue to either profit or break even throughout the season, you're flat betting amount will always be less or equal to 1% of your original starting bankroll.
For example, in August, most of the major leagues for European soccer got underway. If I started with a hypothetical bankroll of $20,000, I would set my flat betting amount at 1% of this starting bankroll, meaning the amount of my flat bet would be $200 per soccer play for the whole entire season.
If by the end of October I had managed to get my bankroll up to $23,000, I would still keep betting the same flat bet amount of $200 for every single bet for the rest of the season. At this stage, this $200 flat bet would be equal to 0.87% of my current (hypothetical) $23,000 bankroll.
By setting your flat bet to 1% of your starting bankroll you minimize the risk of losing large amounts if you suffer a bad losing streak. As long as you can hit 53% winners over the course of the whole season, you will make a profit.
Whichever strategy you choose to implement for your bankroll management, I wish you luck.