I don't have any pictures for you myself, but I will say that you are correct about the size variations in the miniatures.
Generally speaking, the first wave of plastics (last alliance box, goblins, fellowship) are the near 25mm ones. The plastics got larger over time to the extent that you see in the rangers of middle earth and the warriors of the dead box. Why those boxes got larger, I don't know. Other stuff that also went from metal to plastic (like Easterlings, orcs and Dol Amroth knights) didn't share that fate. So, there doesn't seem to be much of a rhyme or reason to it. It could be something internal with GW, like a change in the modeling design team that caused a shift toward Warhammer scale humans.
The metals are bigger than the plastics, but there is also some difference between them in scale. Things like the Easterling and Haradrim captains and they are smaller than the Axemen of Lossarnach and Arathorn for instance. Why this is, again, I can't say for sure.
As for the hobbit plastics, they seem to be more akin to the smaller GW plastics while the resin and Forge world are more like the metals in scale. I am not real familiar with Haradrim or Corsairs so I can't say how they stack up to other things. I can say that the metal armies (khand, Arnor, Far Harad, Dunland) are all of a size with the other members of their same army. I've never found a discrepancy like there is between armies with long, spaces out releases like Minis Tirith.
_________________ "Draw your sword with a heavy heart, but swing it with a heavy hand"
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