For your 115 kg a 133 liter board will definitively be a sinker. That is, very hard to do anything but water starts, especially with an 8 m2 sail and intermediate skills.
If you need the board to float you then you need at least +30 liters (140-145 litres), but that still means wet feet when pulling a big sail. With +40 liter you will be comfortably dry in the rigg pulling phase.
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