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SN74AHCT14: input unsershoot specification

Part Number: SN74AHCT14

Hi,

I would like to ask you following questions about undershoot/overshoot specifications of AHCT14.

1) Could you tell me the actual specification of undershoot/overshoot voltage?

    My customer has evaluated AHCT14 with connecting "pin4 - pin5" and "pin8 - pin11.

    Then the customer observed undersoot voltage, -0.72V @pin5 and -0.92V @pin11.

    Is this undershoot OK?

   And is there any problems about this connection (pin4 - pin5, pin8 - pin11)? 

2) Do you have a guideline to design PCB pattern? (length, width, damping register, etc)

    This time, the pattern design is as below.

         - "pin4 - pin5"    : length 5mm, width 0.2mm

         - "pin8 - pin11"  : length 8mm, width 0.2mm

Thank you for your support.

Best Regards,