RE: 120 litre speed board ????
At 100 kgs too I'm able to uphaul and schlog the ST-115, even in winds down to 5 knots. It's very fast too and 11 cm more narrow than iSonic 122.
Anyway, the obvious choice for you would be iSonic 111 I guess.
Wolume is a little on the lower side, but it's plenty wide for getting back if the wind drops.
The very short boards do not schlog as well though.