You really have amazing list there and I really trust your judgement. I will try Steemworld.org out later today.
I started using busy.org few months ago and i would say it has been simply amazing. The inter-phase is so cool. It is very easy to navigate and use. You get all your notifications on one page and you get to see everything, even those who recently follow. You get to also see those who upvote and with what %. It is absolutely user friendly. You also get upvotes from them when you use their tag and they will never share your pay out with you.
You should try it out and see first.