Question on upscaling & nvidia settings.
So, got a Pico4 but still running an old setup (i5-4670K CPU, 8GB RAM , 1TB SSD, GeForce GTX 1080 Ti).
When running it with my simpit (4K main screen, 3x 10.4" + 1x 4" screens) I usually get a pretty descent FPS (70-90) with ok settings (shadows or environment mappings not disabled or anything).
However, in VR my FPS is terrible. Around 25-30 max with all stuff disabled that is mentioned in this thread. 
So I’ve been reading this topic and some other forum posts on ideal settings in steamVR, Pico streaming assistent and I’m a bit confused now on what I should alter where.
Upscaling.
Keep BMS at 1.0, SteamVR at 100%, Streaming assistent at high instead of ultra? VR Performance Toolkit to 0,7 or 0.9? Or set BMS to 1.4, steam vr at 60% for example.
So many places I can set an up- or downscale I’m not sure what is best and I’m not doing stuff double or triple.
Nvidia settings.
As I understand it, BMS renders and sends to SteamVR, SteamVR sends to Streaming assistent, and that sends it over my UBS cable to the VR headset.
So what application do I need to chose to start fiddling with anti alias etc? BMS, Steam, Streaming assistent?