Working with 360 Degree Images in Spoke - How to achieve best results?

[jl3471]

Hello - I am trying to use a 360 degree (equirectangular) image and have good results walking around in this space. I can't seem to get good results. I tried putting down a floor and a ground plane at X=0 Y=0 Z=0 but it feels incorrect as the ground seems to be hovering. The remixable Spoke project is here: https://hubs.mozilla.com/scenes/yKk7bzc

Can anyone give me any advice on how to get more realistic results walking around with a 360 degree photo in the Spoke project?