As a player system.

I also do not understand the concept of hedge bets at all.

In the concept of each system player should be using the smallest number of numbers because it reduces the house edge.

Each hedge bets causes us to have a larger HE and reduces the potential of the system.

It doesn't matter how many numbers you bet on.

If the numbers you bet on have a 1/37 chance of appearing then the house ege is 2.7% on any money you put into play.

You can bet 1 number or 15 ,numbers or 37 numbers the house edge is still 2.7%.

The only thing the numbers of bets changes is the varience ie The effects of luck on the swings to your bankroll.

But betting more numbers increases the losses as the loss is found by multiplying the HE (constant) by the total amount bet (more).