Just wanted to posted these for others who may have the same problem. Only tested on J5005 and N5000 chipsets, but should work for others.
For stuttering on video playback
Essentially forcing the GPU to max, any other setting has stuttering during playback. In ~/.config/autostart.sh enter the following on an N5000:
And on a J5005:
For graphical tearing issue which is random at top of screen
Then add 'i915.enable_fbc=0' just before ‘quiet’ as follows: