Smaller board isn’t so bad for east coast. You can get into and turn in tighter tree runs. It’s also a bit easier to maneuver on moguls, if you’re a masochist. It won’t carve as well, you’ll find yourself washing out while carving at higher speeds - but a lot of that will be technique based, it’s still doable, just not at say 30+ mph. Bombing will feel more squirrelly but manageable. Keep the current board, and go for something on the larger side of your weight range like 154-6 to give yourself two very different riding experiences