Considering there aren't any DTCs...
1) Are you using the average mpg PID?
2) You can soften the shifts but please read the manual and have a firm understanding of what the change does to create the softened feel.
3) How are the RPMs? If you have the quiet stock exhaust and they are within a few hundred the sounds will be very similar. I know my truck sounded similar for any rpm comparison within about 500 just because of how quiet it was.
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