It would really help placement of boosted habitats if some of the islands were a little rounder or even just less oddly shaped. For example, the crescent shaped island to the left of the main island it is difficult, if not impossible to boost all of the habitats on it. I use it for my farms because of that.
For example, the lower right-most island (I think it is supposed to be a rocky dessert) has a small section that sticks off the bottom of the island. If that space were spread along the left. See the image below. Move the space in the circle along the area marked by the red arrows.
Alternatively, just make the island a bit wider.
Edit 12/13/2017: I updated the image. I had uploaded the wrong one.