I used your second promo code to do successive 50bit max bets - inside the same room I used last time - until I went bust. Ended up losing it all after just 2 hands 

Try running a test version of your casino locally, generate and keep betting 10bits bets, like 5000 of them, then record how many of each you won or lost (disregard all "push" results for this study).

If you get more losses than wins then you have a positive house edge, otherwise you have a negative house edge and you should immediately inspect your RNG to see if it has any flaws that are making such predictable numbers.