Any tips to scale world correctly for GearVR ?

Hi !
I'm currently trying to build a level for my GearVR application, using ProBuilder. The thing is, once I put the headset on my head, I feel like the scaling is not quite right.
I've already tried looking for tips on Google but I didn't find anything that works for me : outdated content, modifying IPD which is not possible, etc. I also tried playing sitted and in a standing position but the problem is still the same : 1 meter doesn't look like 1 meter.
I tried to import my level for a Vive project and I didn't have that wierd feeling, so I assume that the OVRCamera has a different scaling method.
Does any of you have some tips ?
Thanks in advance !

PS: I hope that my english is understandable ^^'