To replace your high wind slalom board, I would recommend you the iSonic 76. Fast, easy-going, very comfy ride, I'm sure it will be a floater for your weight (the hull sinks to my upper ankle with my 65 kg on a dead stop). Absolute great fun with a racing 6.6 sail.
For B&J and freeride blasting, the Kombat 79 is plenty enough for your weight. It's more floaty than iSonic 76 for my weight as well. Great fun with a freeride or wave 6.0/6.2 sail; still rips nice with a 3.7 sail up to 40 knots of winds for a 62 kg pal.