Hi Walter,
This 2 board are very similar but recommend the 137 for heavy racers who want to play in the very light winds under the PWA rules limitation (85cm Wide)
Note that even Bjorn is using the 127 at 103 kgs but also in PWA they race in good conditions.
Both board can suit you with the sails you have, but 7.8 is definitely the sail for the iSonic 111/107.
The fin that we recommend is the R16 50/48 depend of the sail.
All the best
__________________
Rémi
Can answer if you have any questions on this following boards :
Carve 111, 121, 131, 141, 151 & 161
Futura 93, 101, 111, 121, 131 & 141.
iSonic 80, 87, 90, 97, 107, 110, 117, 127 & 137
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UltraSonic 147
Formula Experience One Design
Phantom Race 377/320
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Phantom 295 :
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Formula 167 & 167 Wide :
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Racing Serinity Cat Concept
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