While I am not near your size (5'4, 150) I have a Skate Banana and absolutely love it. It flexes much easier than the Burton Easy Livin that I had before. I live on the east coast too and don't find any issues with holding a carve line on the skate banana. (I actually think I got better when I got this board). I'm guessing I have magnatraction to thank for that. My skill level will give out on a carve before any technical limitation on the board will. FWIW I am riding the 149 model which fits me great for a park board. Rails and boxes are not an issue for the board, but if you're aggressive and go after larger jumps than you may find the skate banana (and any rocker-dominant board really) a little squeamish at higher speeds or on harder landings.
2012 Lib-Tech Skate Banana
2013 Burton Malavita Restricted
2012 Burton Imperial Boots