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Seajuice said..Having a comprehensive list of foil & board sizes would make choosing a lot easier.

Be careful that on these small boards, the shape is also very important for stability and ease of paddling, the board size does not tell everything.
My personal opinion is that:
- you can go narrow, as you can learn to use the foil to get stability, unless you have underwater movements
- you can go short, you can always add fins to counter too much row effect (or yaw), or move the mast back if strapless. An hydrodynamic hull nose can help quite a bit, though.
- too low volume will be exhausting (deck underwater), there is no way around it (unless you can foil-pump back out). Plus it will drastically limit your ability to take off on non-breaking waves.