Even you are using this method and trying to get only 5% profit daily, you can lose money anyway, it's not 100% guaranteed, not safe. Low risk, but it's still there, everytime...
5000 satoshis bankroll is very low, and nobody will want to make 250 satoshis profit daily and stop. To have some chance to make a decent game, must have a higher bankroll, otherwise, the profit doesn't worth the risk.
The spreadsheet is a good tool to calculate your chances and strategies, very useful. Anyway, there is nothing safe on this game and the only thing I can wish you is Good Luck!
