I think you've misunderstood, Tripton means side to side play(horizontal play) that has to be introduced, whether you can detect it or not, from removing material no mater how small from the washers, this has nothing to do with lock up.
If you are fully assembling your knife before sliding in your blade+washer+bushing assembly and still getting a pinched washer (to be clear, a pinched washer is one that gets caught between the bushing and handle slab and will cause a gap between blade and washer) and can't see the obvious reason why then you definitely need to send it in to CRK, there is quite simply a problem. If, as you say the bushing is too short, it will be quite obvious, when the knife is assembled correctly and pivot screw is tightened down fully your blade will either not open or be very very stiff. In this case it will need new washers and bushing and more than likely will be at your expense.