They're fairly standard equipment. The higher the brace height, the less likely the string is to contact your arm. Contact with the string is usually greater with low-braced longbows than higher braced recurves.
Coming from shooting a compound, you probably shoot with a very closed stance, i.e., straight bow arm and 90 degrees to the target. There are ways to grip the bow to rotate your arm out of the way. Putting a slight bend in your bow arm also reduces or eliminates string slap. Finally, opening your stance a little, i.e., turning your body a bit more toward the target, will also yield greater string clearance.
Good luck.