NHL system bet on Goals

I was thinking about a betting strategy on NHL, is working like this:

We choose to bet on the end of the first period and we bet only in case one team has the lead (not in case of a first period draw!)

So lets say the score after first period between Team A - Team B is 1-0 

We choose to bet for the team which has the lead:

and our bets in our example would be:

Team A to win by 5 or more

Team A to win by 4  

Team A to win by 3

we choose the betting amount of each option in order we have the same return (lets say 90$)

Example

 Team A to win by 5 or more @45  we bet 2$ ---> return 90$

Team A to win by 4  @15  we bet 6$ ---> return 90$

Team A to win by 3 @4.5  we bet 20$ ---> return 90$

We also make one last bet

Team A to win by 2 @4 

but on this bet we just cover our previous bet which means in this example

Team A to win by 2 @4  we bet 9.33$ ---> return 37.33$ (=2$+6$+20$+9.33$)

Cocnlusion, in this example the total odd we can calculate is 90$/37.33$ = @2.41 

So to sum up:

If our Team A wins by +1 (comparing to the first period) we get our bets back

If our Team A wins by +2 or more we WIN

If our Team A wins with the same lead, or loses or draw we LOSE

P.S.: I will try to confirm the odds in any chance (these ones were real)

What do you think of the system?

Is any spreadsheet available that can help to figure out if this works?

I have to add one more condition, we bet on only in teams that are leading with ONLY one goal.

But it is vital, if someone can confirm the odds!

I will track the games now for the past three days

On 26/09

Flyers - Rangers  LOSS

Blues - Red Wings WIN

Lightning - Panthers LOSS

Coyotes - Canucks LOSS

On 27/09

Devils - Blue Jackets VOID

Maple Leafs - Red Wings LOSS

Capital - Blues LOSS

On 28/09

Red Wings - Maple Leafs WIN

Senators - Canadiens LOSS

Coyotes - Ducks LOSS

On 29/09

Capitals - Hurricanes LOSS

Blackhawks - Eisbaren VOID

Sharks - Golden Knights WIN

So far 

3 - 2 - 8

Reason of Loss:

Game end Draw : 3

Comeback : 3

Won by only one goal: 2

We keep tracking ...

P.S.: Please if anyone can confirm the odds...

Thanks

Senators - Maple Leafs LOSS

Capitals - Blues LOSS

Canucks - Oilers LOSS

Sharks - Golden Knights WIN

So far 

4 - 2 - 11

Reason of Loss:

Game end Draw : 4

Comeback : 4

Won by only one goal: 3

Panthers - Lightning WIN

Sabres - Penguins WIN

Canadiens - Hurricanes LOSS

Flames - Avalanche VOID

Coyotes - Ducks LOSS

So far 

6 - 3 - 13

Reason of Loss:

Game end Draw : 5

Comeback : 4

Won by only one goal: 4