A couple quick thoughts.
There's actually little that can be learned from the percentage of latakia in the mixture, with respect to whether or not the mixture will be a latakia bomb. That said, 30% really isn't all that much in today's formulations, or even in some of yesterday's classics. The balance of the rest of the ingredients makes all the difference.
If there's a lot of oriental leaf along with it, the latakia tends to make a less dominant statement. When I first brought out my Westminster, I was offering samples at a pipe show. A knowledgeable piper I know tried it, loved it, and said, "This is so nicely balanced. I can't stand all these new blends that are pushing up against half-latakia!" He was shocked when I told him Westminster not only pushed up against that, but through it.
Piccadilly, on the other hand, has less than 30%, yet the latakia is quite pronounced, because of the softer nature of the other ingredients. Interestingly, Ashbury has a just a bit less than Piccadilly, but tastes like it has a LOT less, again, because of the oriientals that dominate the rest of the mixture.
I was visiting a wine maker friend the other day, and he remarked that a cuvée he'd just finished for the year had "only 12% syrah," but its powerful voice came through loud and clear in the blend.
This is one of the reasons I don't publicize percentages of the constituents of my blends. It just doesn't tell much of an interesting story.
Cheers,
Greg