ARKit drift issue with iPad Pro 12.9in (2015)

I've developed an app augmenting rooms with 3D models of well... rooms.
Everything works very well on an ipad pro (end 2017) and iphoneX (2018),

but I've got SERIOUS drifiting issues on iPad Pro 12.9" (late 2015).
I was ready to burry the old guy but then, I tried IKEA Place and it is stable

whatever the number of models I load it with!!!


Did any body know if they used basic ARKit + Swift or is there some other layer?


I tried to average the camera transform over frame detected but I beleive I'm competing

with the ARKit to set the position of the ARSceneView.pointOfView.transform


I'm open to any idea to try to force my camera to stay put...


Thanks