Your first priority should be to figure out where to play the lanes, not what ball or surface you need to use. This will depend on a bit on your style. At 38 feet I would first try to play them out between 4 and 8 board. If they are really hooking out there, then tame down and see if you can find something that will hold a little bit. Also check you swing area out. If they are hooking when you square up, but hanging when you go away from the pocket, then you may need to take everything in, so you can bring your break point in a bit. Team event in nationals was 38 feet, and most people had the best luck outside 10 board.