Hey, I dont really have access to VR Gear when I also have access to Unreal 
Also, I sadly cant really go into detail on how we did stuff for the Star Wars VR Mission and to make it even worse, I havent worked with Unreal and VR yet 
However, what I can say based on my experience and also a lot of informations regarding VR that where released by Epic is, forward rendering is definitely the better way to go for now performance wise for a lot of games. This comes with its own limitations in regards to lighting and a lot of features though. The trick then becomes really just to try all you can do to make it still look good somehow. Even if that means to break PBR more often than you might normally would^^