The Hobie rudder cam is pretty easy to deal with if you keep it greased. Use a marine grease, if possible, between the cam and plunger. Anything will do as a temp lubrication: Suntan lotion, WD40, chapstick etc. Marine or bearing grease just stays there longer. If the cam is stuck down, the only tool needed is a blade screw driver. You work the blade between the cam and plunger to force the plunger down and release the cam. Don't bother with the big screw under the spring, they are always fused in place.

If the cam keeps getting stuck, even when greased, there is a miss adjustment in the upper casting plate (newer boats), the rudder is drilled wrong causing too much play in the system or it is worn out (too flexable) where it hooks the upper casting.

Battens?

With proper batten tension applied which removes the wrinkles from the sail when inserted, proper downhaul which removes horizontal wrinkles from the sail when hoisted and downhauled...

The sail should have an airfoil shape. If the wind does not pop the battens over to one side, a quick pop of the mainsheet or yank on the boom usually pops them over. Light air and too much batten tension or downhaul can make it more difficult.