Well hold on you have several thousand replies, posts, etc what optimizations have you done serverside if any?
I feel like this should be directed to their page..
https://wordpress.org/support/plugin/all-in-one-seo-pack
I will say though that this is a common issue with bbPress and BuddyPress when it comes to SEO tools. They need to find a way to get proper meta descriptions and titles without borking everything :p
