This is PRECISELY why you might want to use a separate line for each team. If you've got a number of steady winners going along and winning you a few units a night, you can then afford to "invest" in a team which is good but on a losing streak.... even after the streak the Caps are still 19-12-2.
I run multiple systems, one line per team, plus this system, which is 1 line for different teams, plus another couple like that. One of those systems (one line for multiple teams) just went through a 9 game losing streak which took it from +14 units to -29 units and has since recovered to +5 units. If I had been using a single line for everything, I would have lost it all. As it was, I was able to live to bet another day.
So in your thinking about money management, don't forget to think about risk management.