Perhaps a poll? You have had feedback from various sources that individual posters will not have heard. A couple of thoughts:
a) some forums restricted to only forum members (current proposal);
b) most (except member discussions) forums open, but names suppressed unless you are a forum member;
c) use of pseudonyms for posts, but forum members can see ‘real’ names;
I’m sure there are more options that folks have mentioned to you.