Mr. Nestorovic told me months ago that for the concrete version the distance between wall and satellites (back side) sould be approx. 2m (1.9...). I think the specs that you have are the old ones.

I will call Nestorovic next week about the achievement of the time  alignment. I don't want to disturb him now since in the laast 3 weeks I called him nearly every day and I believe he could get annoyed about hearing me so often.

I will certainly come back with his answer either here or with a pm.