There are some interesting variations that can be used with paroli-type systems.
One of which is known in some circles as the Stepladder. Here is an example....
1 2 3 4 (5) 6 7 8 10 12 14 16 18 20 22 25 30 35 40..etc
With this series you start at 5, and move up one rung when you win and down one when you lose. This way, should a winning streak begin immediately after a loss or two - you won't have to start back at 1, and will reap a little more profit from it. The progression / regression both ways is mild. An ultra conservative way to play this is to move up one level only when you're a net winner at the current level.
At what point is it conservative, if start from 5 and win once +5 and then wagering 6 and lose, now you are -1.
We deal with a 50/50 game and why would some one give back hes winnings to the casino?
Thies means i have to win two in a row to stay in profit which is not so good.
If i place 5 units and win i have one decision to make, how much should i lower my bet to keep a profit and not being a loser.
This is not personal, but i want more players to see the real march behind this staking solutions.
Same with flat betting, you have to win two in a row to keep +1 unit profit.
Also guetting which make you wagering up to three times to keep a profit.
I can show a winning sequense where Regression Up & Pull is superior.
First you can never lose it all back after winning once, one bet.
After that Everything is bonus and if you strike and lose you last bet you take a smaller bite into past winnings then what Guetting does.