This method i've been playing for awhile with good results. it's a 6 numbers bet. Progression is not perfect, it's rather a "loss reduction"...
TRIGGER- do 1 spin, then bet the 3 unhit streets & 2 unhit columnstreets within the dozen hit-- 6 numbers bet, straight up.
Progression- double bets after a cycle of 6 spins.
Fist test was played with 1u bets, wingoal +500u
Looks like you're on the right road here?!
He who seeks...
It looks good