Gear VR S6 shadow issue

Hello I'm developing app on Gear VR and recently went from note 4 to Galaxy S6, where I get really wierd shadow edges (picture1) which are really annoying. I found out that switching rendering path from forward to deferred does the trick, but then the movement and rotations are really jittery, making it unplayable. This problem is only on the S6 phone, not in the editor nor on Note 4. Appreciate any advice.

Thank you.