I can see the biggest deposit bonus on your list is 5BTC. I think you should check out 1xBit as their welcome bonus is up to 7BTC.
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^ You cannot lure old gamblers with the bonuses if we are talking about the legitimacy of the site, there is a possibility that you will get scam by the gambling site or they will not give your fund. As you introduce and the 5BTC bonus are the gambling sites that have a horrible history here in our community. You introduced 1xbit that has a welcome bonus that is up to 7BTC, while Cloudbet with 5BTC has also known here that has not had a good record. Just like what was introduced by op on the list, all of them are new in my eyes I don't know how legit they are.
Well on 1xbit yes they don't deserve to get a high ratings since even by now there are people comes and complain about their service provided to their bettors so lowering their ratings which OP already is needed so that no newbie gamblers will though that 1xbit is a good site to place our bet. But in Cloudbet so far they are doing good right now and their past issues has been solve so its good to give a chance since so far they are active answering when there are users who got a issues and complains toward their site.
Note: I don't vouch Cloudbet but that's what I see so far to them.