I would have someone else shoot it. My gut tells me that it’s operator error.
However, if you’ve had consistency with other rifles and this thing really does actually shoot 9 very precise bullets with 1 way out of precision, then perhaps something is wrong with it.
An 11lb .308 isn’t a particularly hard recoiling rifle. But you also said you lose sight picture which has me thinking it’s you.
If other shooters have the same problem, then I’d go through the easy checklist of things: free float, bedding, re-torquing and nail polishing screws, etc. If you still have the same issue, send it back to the builder.
I will say that anecdotally, it seems folks have way more problems with “custom” guns than off the shelf quality rifles.