I think your 20% profit setting is quite high because many time I lost my deposit even before reaching 10% profit of my bankroll.
I don't think by just changing your seed you can change your luck.
This dice game just play for fun and enjoy your time and don't expect a big profit otherwise you don't enjoy your game if you lose your money.
I only play dice and Roulette games and I have owned accounts in couple of sites. After being active a couple of years, my understanding is that even a 1% profit setting holds no guarantee for any player and the longer a player pushes a particular strategy, the more likely the system catches up with the next move. My suggestion is to always set out with a bunch of tested and working strategies and then to always have them randomized.