It seems like you've already thought it all through. I do agree with you that the stiffer grind of near wedges will not deflect as much, if at all, and so the hair cutting will be more quiet in comparison to a full hollow being more likely to ping when the blade flexes. I think that effect with the HHT is the same explanation for why it feels different during the shave.

As long as you are happy with the shaves, you might have to remain satisfied with that.