I was going to say go and put a scam accusation on them if you really think they are scamming, but when I re-read all your infos you said they use the same script as another casino, which is fair reputable to be honest, so maybe you got just unlucky?
I know that when saying about being unlucky, 'cause I tried them all, i both fake and real chips.
And yes in fake money there seems to be always a better chance of winning just because it's to attract user even more to the slot you are playing(or just because in fake money you are careless of how much you spin).
Remember, it's even how you feel about a slot, positive karma helps a lot(I got like 2 or 3 days of luck winning like from 1 to 3 btc at bitcasino) so I'm certain the karma will certanly help.
For example, there are a couple of slots I evade because I don't feel they come up with big wins, while others makes me feel a great win is coming up.
An example, when I have enough, I try to go for the jackpot slots, like Good Girl Bad Girl or rarely the Greedy Goblins.
I love the inner games they have in GGBG because they make me feel I'm choosing my own luck.
Still, if you think that casino has something bad in it, just do a formal scam accusation
https://bitcointalk.org/index.php?board=83.0 If they are on they will answer you.