Since you have tested for this and found it's free-floating, why not try a pressure pad on the end of the forearm?
I use a small folded piece of bicycle inner tube (don't make it too long).
If that pressure point on the barrel doesn't work I keep the pad in and cut a few more lengths of tube. Then slide the tube over the end of the barrel and place it on the fore-end.
You can fire 3 shots then adjust the tube forward or back until groups tighten up.
It works on barrel harmonics again...successful on many of my rifles.
What have you got to lose except an old bicycle tube?
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