I'm about to post something completely outside of the bracket.. but it might be worth consideration
(80/20)^2
basically you got 2000 new threads in tlr each week
What to do??
Let 80% roll, consider taking action on the weakest 20% (400)
Of those 400, consider merging up to 80% (320) into recent yet closely related threads
Consider moving the other 20% (80) to a different forum (inc bushes)
What constitutes a weak thread is not as completely subjective as people think
Basically.. is this a new topic or a fresh take on an existing topic??
And as a tiebreaker, what maximum potential upside does it offer??
Now 400 actions a week is a heavy load..
10 minutes per action .. that's 67 hours a week
probably need 7 mods to run that program

but it IS possible
Notice i didn't say a word about deleting anything or banning anyone ..just packaging the forum in a way to boost its quality and refocus interest