Personally I prefer to calculate it using the definition often used by sports bettors, it's called the Yield and the formula is very simple :

Yield  = Profit/Loss / Total money staked

So just work out the profit or loss for any sequence of bets and then add up all the bets you made (in terms of stakes, so it doesn't matter if you used a progression.) Divide the first by the second. Easy to calculate in a spreadsheet. For your sequence I made it a total of 85 units staked, so the yield (edge) is 83/85 = 97.65%

This seems more usable but then we would have to include all spins watched.


-1 = 36
-2 = 18
-3 = 3
-4 = 1

58 bets placed
42 np