This will be a really strange suggestion, but back a long while ago I was having problems with tearing in vlc that would bizarrely resolve itself so long as I had the effects and filters popup window open. Ever since then I have just always kept the window open whenever I watch videos. I honestly have no idea why this works, or what was causing the tearing for me to begin with, but what I can say is that as long as I kept that window open the tearing would disappear. Worth trying out at least to see if it fixes your problem as well.
