Question Is it possible to get 360 Stereo VR video 90 FPS?

I'm doing due diligence, I know this is kind of a tough one. Has anyone seen this done? As the title says, I need to get these requirements to pass submission on the Oculus store:

App must display graphics in the headset at 90 frames per second (Rift), or 80 frames per second (Rift S) on Nvidia 970 GPU running Windows 10

App must display graphics in the headset at 90 frames per second (Rift), or 80 frames per second (Rift S) on AMD 290 GPU running Windows 10

Client is insistent that they don't like the quality when displayed at a lower rez than 4k. I am using the AVPro video plugin and it's still giving me @65FPS with my h264 video. HAP video hits 90 FPS but plays back choppy (and filesize is too huge, like several GBs). H265/HEVC is no good since the codec must be manually installed by the end user.

Curious if anyone has been able to achieve this, or condemn it? Have any pointers? I've been racking my brain on it for far too long. Other notes - scene is empty aside from the skybox, no fancy alpha or anything. My machine is using NVIDIA GeForce GTX 1060 6GB. Thanks for reading.