I am nominating +Joe Sylvester
for this circle. He writes about Kauai at http://TurtleCoveSuites.com
1 or 2 times a week from his deeply knowledgeable perspective of the land and the people. He always includes original photography and some original video as well.
I write about Japan (I was an exec there for 20 years), Kauai (I am now based there), Social Marketing, WordPress, sustainability, food and fitness.
I would love to be included in your shared circle. I fully agree with you that the only useful circles are with people that are currently ACTIVE on G+. I define the threshold for that as having posted in the last one week.
I found this shared circle thanks to the lovely +PJ Ammidon
I am in the process of launching my own GooglePlus shared circle called #BlogBuddies
. It will be smaller than yours. It was created out of a conversation on +Mack Collier
's popular #BlogChat
twitter chat Sunday night. http://itsdifferent4girls.com/2012/08/blog-buddies-google-plus-circle/