I am 96kgs

too and I was out on a 116L Mistral Syncro on the weekend. When there is some wind, even if not planing, the board rides above the water. When there is no movement of the board at all then it would sink.
The wind was light and when I had to uphaul once instead of water starting, the board would sink and it was a bit of work to uphaul. This was with a 6.5m sail and a nice light mast. Once moving it would rise out of the water.
If you really want a board that is easy to uphaul in next to no wind, I would look for something around 120L. I have three boards around 115L and they all react the same.
I think with the larger boom, mast, and sail, 115L will be too small for you. My next board up is 135L and easily floats me, but I don't think you would need to go up that far in volume.