island hopping

Thank you to Gedemon for your map pack (YnAMP), it gave me everything I needed to start on this map script. This map option creates continents in a slightly new manner. As opposed to continents being built from top to bottom, the continents now generate with gaps at the bottoms filled with...

tldr; every time I start an Island Plates map I start on a relatively large island with three or more civs. Shouldn't the landmasses be smaller? Why would the achievement name be 'Island Hopping' otherwise, considering with 12 civs there would be a minimum of 4 islands needed? Every time I...