This may be the perfect system... 8) 2 Quads bet with a special progression, (invented by me!).
Name inspired from a song, a german heavy psych band i used to listen to as a kid! ;D
Procedure: Wait for a hit in column 1 or 3, then you bet 2 quads (at the 2 unhit DS) within the same H/L, (at the 2 unhit columns. (see example pics!)
Progression: Double bets after each 3 losses in a row. (This progression is not perfect, but perfect enough for this purpose, There will be a little drawdown if progression goes to far, and it hits on the second or third spin, BUT in the *Long run* you should reach your wintarget, because most hits come early!)
(First test played with 5u bets, and Live-spins).
Oops! I failed, and i failed badly ....should've done more testings... sry :question: