I don't know why but i mostly lose on provably fair, when start betting then some times the graph stay green, after betting some more bets it become red and go straight down, draining my balance.
~snip~
^You can simply ask the casino staff about their provably fair system and I think you can verify it publicly.
I never think of winning big once I am gambling, because gambling should be done for entertainment purposes only, and never with the expectation of winning big. I may suggest choosing always a reputable casino if you have doubt about their system because a reputable casino runs their business legitimately, remember that the gambling industry is a business nothing more.