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I'm not sure what being poor at maths has to do with it since you only want to subtract 1 multiple times! Anyway sounds like you want a trigger zone that can be configured to output a certain number of pulses rather than just 1.
I would make a microchip with a trigger zone on it. Include a value slider where you configure your decrement (1, 3 or 8 in your example). Add an output node. Then you use a combination of a timer and a counter to output the right number of pulses. The chosen decrement will be wired to the target value of the counter (forget the exact name). Then a timer is used to create a delay before incrementing the timer again. I'm glossing over the details I know. I could share a version of this.
Then you have a chip that you can clone and configure as many times as you need rather than having lots of trigger zones wired up to a whole mess of logic.