I don't think it works like that. Your bet stake is rounded down to the 5% first and then profit and losses are applied to that new bet stake.
So you won't go down 50% at once ever.
Fixed. Thanks
I only see a problem with your system. We can all just allin if things are going wrong to try to recover from previous losses, meaning that the luck factor would increase, and as the OP always mentioned that was something that they were trying to reduce in this competition. And 5% max bet stake of current bankroll is a normal value for professional punters since it provides decent bankroll management (some only use that when they are very confident, and the normal value is 1% to 3%), so I don't see any problem with the current system.
In my case, when I bet a high odds I don't use the max 5%, since the probability of losing is big, so I also adjust my stake according to the bet odds, that way I don't experience such big changes with my bets (but that's my strategy, not saying it's the best one).
Anyway here are some more bets for the competition:
Toto ~ Parlay09/20/2015 14:00, Corinthians v Santos, Double Chance, Home or Draw
09/20/2015 14:00, Goias v Joinville, Draw No Bet, Goias
09/20/2015 14:45, Vitesse v De Graafschap, First Half Goals 0.5, Over 0.5 Goals
09/20/2015 12:30, Excelsior v Ajax, First Half Goals 0.5, Over 0.5 Goals
09/20/2015 14:45, Groningen v AZ Alkmaar, First Half Goals 0.5, Over 0.5 Goals
09/20/2015 12:30, Achilles 29 v Den Bosch, Over/Under 2.5 Goals, Over 2.5 Goals
09/20/2015 14:00, Zenit St Petersburg v Amkar, Over/Under 3.5 Goals, Under 3.5 Goals
09/20/2015 13:00, Roma v Sassuolo, First Half Goals 0.5, Over 0.5 Goals
09/20/2015 18:15, Porto v Benfica, Draw No Bet, Porto
09/20/2015 13:30, Stuttgart v Schalke, First Half Goals 0.5, Over 0.5 Goals
09/20/2015 14:30, Rapid Vienna v Admira Wacker, Asian Handicap, Admira Wacker +2
https://www.directbet.eu/BetStatus.cshtml?BetID=1FDKyRjXaZpi34ifYahqGhBGShnuWKA8XtToto ~ Parlay09/20/2015 18:15, Porto v Benfica, Draw No Bet, Porto
09/20/2015 13:30, Stuttgart v Schalke, First Half Goals 0.5, Over 0.5 Goals
09/20/2015 10:30, Roda JC v Feyenoord, Draw No Bet, Feyenoord
09/20/2015 14:30, Rapid Vienna v Admira Wacker, Asian Handicap, Admira Wacker +1.25
09/20/2015 15:00, Monaco v Lorient, Draw No Bet, Monaco
09/20/2015 15:00, St Etienne v Nantes, Asian Handicap, Nantes +1.25
09/20/2015 13:00, Roma v Sassuolo, Asian Handicap, Sassuolo +2.25
https://www.directbet.eu/BetStatus.cshtml?BetID=16xMdbKheVaq2esMohRQF4wVjG7UrcVmijToto ~ Parlay09/20/2015 18:15, Porto v Benfica, Draw No Bet, Porto
09/20/2015 14:30, Rapid Vienna v Admira Wacker, Asian Handicap, Admira Wacker +1.25
09/20/2015 15:00, St Etienne v Nantes, Asian Handicap, Nantes +1.25
09/20/2015 13:00, Roma v Sassuolo, Asian Handicap, Sassuolo +2.25
09/20/2015 13:30, Stuttgart v Schalke, Over/Under 2.5 Goals, Over 2.5 Goals
https://www.directbet.eu/BetStatus.cshtml?BetID=1Ctv6BH8sjzbapk4PTyZKWeyYVG2j3bFvJToto ~ Parlay09/20/2015 14:45, Vitesse v De Graafschap, Match Odds, Vitesse
09/20/2015 12:30, Excelsior v Ajax, Match Odds, Ajax
09/20/2015 14:00, Corinthians v Santos, Match Odds, Corinthians
09/20/2015 14:00, Goias v Joinville, Match Odds, Goias
09/20/2015 21:00, Portland Timbers v New York Red Bulls, First Half Goals 0.5, Over 0.5 Goals
09/20/2015 18:15, Porto v Benfica, Draw No Bet, Porto
https://www.directbet.eu/BetStatus.cshtml?BetID=18bkY2SjDFEMk6JJfXwSunuixqJUPH2smToto ~ Parlay09/20/2015 12:00, Slovan Bratislava v Trencin, Draw No Bet, Trencin
09/20/2015 10:30, Mordovia Saransk v CSKA Moscow, Over/Under 6.5 Goals, Over 6.5 Goals
09/20/2015 17:00, Spain v Lithuania, Moneyline, Spain
09/20/2015 13:30, Stuttgart v Schalke, First Half Goals 1.5, Over 1.5 Goals
https://www.directbet.eu/BetStatus.cshtml?BetID=15PYszAiBNhcrj2nhNwqkCrUe8xWojhRko