I've came across a system called "star 2.0" on youtube. it's a hybrid system. It has two stages.
Stage 1 is flat betting until you're down 7 units.
Stage 2 is a neg. progression (5, 5, 10, 10, 15, 20, 25, 35, 45, 60)
After a win you parlay it once. The "hammer" bet. If the hammer bet wins, start all over at 1 unit. (I stop at this point if I'm ahead 1+ units)
RichInMich