Myself and others have experienced similar issues with the aka's cracking and bending, but not just on the TI's, on the AI's too. Stress lines have been spotted over the outside of the bend on AI/TI's that haven't been bashed around in adverse conditions.
I'm starting to think that since they upgraded the outriggers in length, Hobie should have strengthened the aka's too!!
This is a photo of a stress line that has formed on my AI's Left front aka.
This is a photo of a stress line that has formed on my AI's Left rear aka.
This is a photo of my AI's Right front aka, there is no stress line, but there is some inwards deformity in exactly the same location as on the others, (noting that it must be a manufacturing fault as its exactly the same location if you where to put them all side by side).
This is a photo of my AI's left front aka knuckle, the aka tube has considerable play inside the knuckle that has caused the retaining rivets to come loose.