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before spending money on servicing etc - make sure your forks are set up correctly for your weight/riding style/riding conditions etc.
Just because your not using the full travel doesn't mean there is anything wrong with them.
Is the sag set properly?
Is the rebound set correctly?
etc etc
There is generally no "stock" settings it's all about each rider.
I agree with you except these forks only have a external rebound control which as far as I know has no effect on travel. To set the sag or compression you need to change the spring stiffness, if it was a air fork then I could adjust pressure and set it up. But I can't really do anything about it without taking it apart and checking spring values, which isn't a job I fancy doing myself.
I was told that if the seals had gone then I wouldn't get the full travel regardless of how firm the spring is, hence wondering about servicing?