Hi,
I have 2 suggestions for helping to reduce redundant posts, but I'm not sure how feasible they are or if you've already thought of them.
1) Make the search function more prominent on the site and change the search term parameters(?). Sometimes it takes a little finagling of the wording to get the results wanted, and sometimes the top results don't even have the key phrases in them. If the search function were more obvious and worked better, perhaps more people would take the time to use it.
2) You know how we get that helpful little warning before posting a reply that tells us a reply has been made since we started writing? Can we get something like that for New Topics? For example, if someone puts a title on their topic similar to one or two threads already in existence, perhaps a little note could pop-up before they post it suggesting similar threads already exist (links provided), and to please check them before posting.
It's kind of ridiculous that we'd need something like that, since it's just common sense to search first, but people are lazy

Anyway, I'm sorry if these suggestions aren't technically feasible. I'm really a grandma at techy things. Thank you for all your hard work!