What about this

Ok so our trigger is to wait for a number to hit from the 3rd column, any number so 3,6,9,12,15,18,21,24,27,30,33 or 36

We then place 1 chip on that double street repeating.

So if number 12 comes, we place 1 chip on double street 7,8,9,10,11,12 and spin once, if we win, we are up + 5 units, if we lose we wait for another trigger (number from 3rd column) to appear and repeat the process, we can use the progression

1,1,1,1,1
2,2,2
3,3
4
5
6
7

STOP

So this gives us 14 chances to hope for a repeat.

What we think, something to test.

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