Those are indeed the tropics... The tilt is only 7°! There's a fair bit of eccentricity in the orbit, however, so the seasons shouldn't be too bland.

I've gone ahead and appended the original post with the pressure maps. Hopefully someone with a more intelligent eye can see where I've gone wrong. My assumption is the high pressure system would simply wind up dumping its rain as it rose over the mountains on the west continent. On the west I just sort of guessed :/