SD- Perhap the easiest solution of all... Lower Your Head!
Or, since many on this site are more technical, maybe try applying some sort of lubricant to you head so the boom slides off more easily. That way it could only land a glancing blow! Maybe for those with "hair defeciency" a light spray of non-stick cooking oil would suffice????
hunter Legend 37 Semper Paratus
Formerly - Tartan 34C Yawl