@chairman, we reported the same after the airbag update also. I think there is a hidden ecu update that reduces jerks when releasing clutch. Since we often do potholes at half clutch, the feeling is of a smoother ride. The Delta's ride is compliant to begin with and a reduction of 1 or 2 psi greatly improves the ride. So if thw ASC's gauge is out of calibration as they usually are, they may have given you a lower pressure improving your ride inadvertently.
The issue of gauges calibration is quite rampant. I usually put in 28psi in me Zeta now. Yesterday i had TPMS installed. The tyre shop doing the installation is a reputed Bridgestone dealer and kept telling me his gauge is well caliberated. But he topped up 28psi and the TPMS reports 27psi. The ride in the rear is consistent with 27psi. Thus is gauge is out by 1 psi which though nominal, makes a big difference to the ride
Ameyam
The issue of gauges calibration is quite rampant. I usually put in 28psi in me Zeta now. Yesterday i had TPMS installed. The tyre shop doing the installation is a reputed Bridgestone dealer and kept telling me his gauge is well caliberated. But he topped up 28psi and the TPMS reports 27psi. The ride in the rear is consistent with 27psi. Thus is gauge is out by 1 psi which though nominal, makes a big difference to the ride
Ameyam