LOD batching

Hello, I have a big scene with a lot of LOD groups to maintain god performance. The objects are all static and lightmapped, and I use light probes to lit correctly the upper LOD levels. But, by doing so, i go from 200 to 1400 draw call. While I'm in VR, it's going from 400 to near 3000 draw call by using probes. The frame debugger says that objects are affected by different light probes, even if the objects are using the same ones but from just another position.

So my question is : how do we lit correctly (direct light + indirect light) a large amount of LOD objects and keep draw calls low. Or, how do we do a correct lighting scene with a lot of meshs and without LOD.

Thanks you in advance.