I just posted a new video on Youtube channel explaining Anti-Aliasing in UE4 and how to get rid of unwanted artifacts like ghosting / bluriness.
Please let me know what do you think.
Here are settings we are using for additional TAA look:
r.TemporalAACurrentFrameWeight 0.2
r.TemporalAASamples 4
r.Tonemapper.Sharpen 0.5