The "boom" positive progression is intended to exploit the common happening of a location showing multiple times within a cycle.
This is entirely cycle-based, which means you should never deviate from the max. spin that closes it.
You assign the amount of units of a payout to face the cycle.
The basis is that you will re-invest the units won, divided by the number of spins left to cycle-end.
Example: You are betting a single number and get a hit at spin 15.
Cycle = 36
Hit at = 15
36 - 15 = 21
21 is the amount of spins left to sustain the bet.
How much to rise for those spins?
You rise by the result of payout divided by spins left.
In the case of a straight-up number, it is:
(36 * 1) / 21 = 1.71
So you add +1.71 units to your base bet for the rest of the cycle (tops).
1 + 1.71 = 2,71 units on the number now.
Shall you get another hit at -say- spin 23, your accounting will be:
36 - 23 = 13
13 spins to sustain the new bet.
(36 * 2.71) / 13 = 7,50 units on the number.
To be held for the next 13 spins tops.
Of course, there is a point in which you must take your wins, so it is advisable to take profits when on the plus, especially when playing several numbers this way at the same time.
At all times you know you are risking EXACTLY one payout of your base unit.
In the case of a single number it is 36 units, but in the event of having concatenated wins in the cycle, the ROI can rise handsomely.
This can be extrapolated to nice-paying locations such as splits or streets. Lower-paying locations do not offer enough for it to really go “boom!”, so you better stick to the higher-paying betting locations when considering this.