Similarly, what's the best way to find answers that need reviewing or checking? I use review, but I am still limited to first posts and late answers.
There doesn't seem to be any easy way to do this, though I'd like to have one as well.
Try this search. It shows posts with a minimum of one answer, with the number of answers displayed next to the title. Just choose the questions with less votes and a few answers, and look for hidden gems.
Even better, set up a chat room and find a bunch of like-minded people willing to look for and vote on awesome but underappreciated questions. But don't use this to advertise your own posts, and make sure others don't, either. (otherwise it can be called vote-ringing, which is punishable). This is already done to some extent in most tag chat rooms, in fact--if someone sees a great answer in the tag, they post it.
If you see a really good answer that doesn't have too many votes, place a bounty on the q
with the option "to reward an existing answer".
Another option is to share good posts on G+/Twtter/FB
What's the best way to encourage users to review/check answers? Specifically, lone answers to tumbleweed-type questions
Well ,you could set up a chatroom as shown before, and advertise it on various other chat rooms. Or you could push for a [meta-tag:feature request] on meta that lets us review such posts (maybe those with a high character count but low votes)