Look at the X-Stream Helmet
With FNA Helmets you custom fit (outfit) every lid. This has been the choice of just about every Pro paddler with a small lid.
I'm a fan of the hard outer shell and adding additional foam to the helmet (more than normal) would only make it safer and more impact resistant.
Many folks have retro fit this helmet with a vertical metal bar (keeps sticks out). If you choose to do so and why not, you want to use an older version LiquidLogic security bar. It fit's perfect and you see multiple examples online.
Peace and it's worth it.