I do not know anything about bonus promotion, but then, if you are looking for a casino where you can enjoy the best of slot gaming experience from the slot game provider you mentioned, then simply go for Stake.com.

I started playing on stake far before I joined their signature ad campaign on this forum, and I can tell you for sure that the experience have been nothing short of amazing so far, perhaps you are a slot game lover?, I am a slot game lover too, and aside me not knowing what you meant by promotional bonus, but assuming what you meant is like a sign up bonus, then actually, stake is still the best casino to choose, for aside sign up bonus, there are several other bonuses you enjoy weekly and monthly as an active player on Stake, you can find out more about this by simply reaching out to their customer care on the site before making your final conclusions.