I would suggest you need to invest the amount that the bet warrants.
If you feel more confident, then bet more.
Each individual bet is just that. And the amount invested should not bear any relation to previous or future bets.
Of course you wish to get through losing runs and perhaps should limit your total weekly investments to perhaps 10% of your BANK.
Which would mean investing $200 of your Starting Bank.
And if you can earn 30% profit on that over the season, it would be a win of at least doubling your Initial Bank.

The hardest part is to control yourself and not shake when you have a nasty loss.If you ever get depressed or angry about a loss, it is because you have invested more than your comfortable limit.