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peterowensbabs said..
Think of the gaps in sail sizes like a curve on a chart small gaps at one end big at the other...a 4.2 to a 4.7 is a big enough jump a 6 and a 6.5 is not. In my no expense spared dream quiver to cover every possible wind strength I could cope with i'd perhaps have something like a3.8, a4.1, a4.5, a5.0, a5.6, a6.3, a7.1, and an 8.0 and a 9! But then id spend all day deciding what to rig up!
For freeride, freerace 0 to 2/3 cams sails i learn that a gap of 15 to 20% between each sails is good.