First I have to say that your buffer weight may still be to heavy and you still have not tried the recommended weight of a standard "H" or Carbine buffer, Second I have never seen IMI 5.56 being "Weak" and it usually runs a little hotter then standard 5.56
That said I still think you are having a issue between the A/A BCG and the VLTOR buffer tube, that scoring is abnormal for the small number of rounds fired and I would once again recommend shooting your upper on another standard AR lower and see what the results are.
So in closing I have to add that if your not going to follow the past suggestions that were already offered then the chances of correcting your current issue is slim. Rigid thinking is not the best route in working out the problems with your AR and just because you think it should work does not mean that it will.
We are all inclined to judge ourselves by our ideals; others, by their acts.
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