Double Doz and Cols has a expected hit rate larger than an EC. We will win most of the spins. 2/3 bet is a grinding, and has some problems which many players do not take care about. A losing streak can be rather long even if 2/3 of the table is covered. I should not play 2/3 on an American Wheel. If we get back half the bet on an EC if zero hits, it is better play EC.
On a Wheel with NO zero or just one zero, a 2/3 bets should work just fine.
A common progresson is a Martingale style using 3 fold each step, and it is for sure a catastrophic situation to expect in short time.
As we hit most of the bets, we DO NOT need winning all back in one spin.
I did this morning a 2 Col play using NOZ and 0.1 chip, targeting 100 units (10 Euro). With the right play and not short bank, it is near sure to get it.
The "system" is very conservative it can take some time.
We need a bankroll of 1000 units (300 can do, but better be safe than sorry).
At each DOZ we start with 1 unit, as long we win stay.
If lose first bet next bet is 2 units each.
If we win we are break even, and start over using 1 unit each.
If lose the second bet we use 3 units stay as long we win, But reduce all the time so next win is break even if we are Close to that,
If loss on the third bet we bet the same (3) again and do so to the next loss or break even.
The progression is simple 1 2 3 3 4 4 5 5 6 6 7 7 8 8.....
The game I did took 257 spins, and the turnover was high (1148 units), that's the reason a high HE makes 2/3 bets difficult, as on AM wheel. At NOZ the turnover doesn't matter.