Tested 700 spins with this so far, and I'm willing to see what others make of it. 
Any number spins, leave out that 18 (high/low), that dozen, and that column---and play remaining numbers. 
That's it--real simple. Usually you'll remain with 12 nos or 8 nos to play next spin. 
So--if 3 plays--leave out 1-18, 1st doz, and 3rd column. Twelve nos remain, and you play those. 
If a no from middle dozen plays (for example:16) do the same. You'll remain with 8 nos to play next spin. 
Like I said, and it went up and down---AND UP AGAIN. 
AFTER 700 SPINS, I'M ACTUALLY UP AT +178! 
FLAT BETTING--SINGLE UNITS!
 
 
I tested this for 700 spins---lowest dip was -179, but it flew right back up within next 100 spins or so. 
Was at +178 at 700 spins (highest was  over +200 ) 
So I'm thinking--wait for it to peak at 100 or 200 spins, then run! 
That's it for now (and it can be played in split bets too, of course). 
NEW KEN