Thief %/s (KMS Unlimited and GMS Tempest)

MI hit - 108451, phantom blow hit - 67012. had 30% boss damage, 6% total damage, and Final Cut. 108,451/67012 = 1.618. .7(mirror image) * 1.36( boss damage and total damage) * 1.7 ( final cut)

also used regular attacks on monsters and got hits that were higher than possible with 1.4x final cut.. though I didn't really put a lot of effort into testing without mirror image.