Are all the slots the exact same payout at 6-7% or is that % an average of what your slots payout combined?

Does anyone know the house edge to the slots at this website? I do not recognize any of the slots from previous casinos that I have played at.
I played the slot lucky 7 but was not so lucky.
Would be cool to know the house edge for the slots here or if someone could recommend a good slot that won't rapidly drain my BTC's.

I deposited over a week ago, am happy to do any security checks they require but they never make any contact with me 

I registered with this website. I deposited 0.5btc hoping to receive their 200% welcome bonus but after I deposited no bonus was added. I contacted them through their live chat several times but they never answer anything, all they say is hello how can we help you then never reply to my questions. I also send emails but never had a reply. So is this bonus for real along with the whole set up they have here. Not good practice to not reply to questions n my opinion. Hoping they will explain here.