If your pressures are normal, then I would perform the cycle time tests for each circuit. If cycle times are slow, that would indicate a flow problem. Although I have limited Cat experience, on most others, if it is mistracking, it is likely a pump issue. Either the pump is worn out or it's not swashing enough. Then it would be onto a case drain test of the affected pump and check pilot pressures. Also make sure your suction screen filters are clean.