At your weight I would recommend either the Jimmy Lewis Striker 8'5"x 30" x 4" (116L) or destroyer 8'0" x 30" 115L or the next sizes up if you want more glide and comfort but its not as fun and whippy on the short board
I'm a beginner to intermediate 80kg and I ride the super frank lean 8'0 x 30"x 4.2" liters 115L and is not as stable on rough days but its soo much fun once your on the wave