It's interesting that the blends we smoke are experienced so differently. I've smoked all of those, and Marlin Flake, which I don't care for at all. It's the cavendish, hot air mostly, that makes it so bland.
To me, HoTW is totally superior. It's a flavor bomb, well balanced, tangy, a little sweet and with almost none of the bitterness that most va/pers develop towards the end of the bowl. The Perique is very much a condiment, noticeable more in the way that it enhances the tanginess in the virginias than in itself.
Old Gowrie is furthest away in my memory. It was good, quite similar to HoTW, but I remember a slight nutty flavor that I associate with burley and don't care much for.
Brown Clunee is one of the blends I'm smoking currently, my first tin of it, and it seems to have much more perique in it than the others, maybe except Marlin Flake, which also has it in abundance. Too much perique for me, as it overpowers the virginias with a peppery quality the goes bitter in the last third of the bowl.
It's not bad by any means, only not good enough to make me want more of it.
I'm not a blender and haven't a clue about percentages and stuff.