You have 2 concerns to think of Abuse/stress and reducing safety functions.

Add the age of the power and drivetrains.

From that you have to decide how much and is it worth it to costs of repairs.

Allowing more torque ( reducing TM) puts more stress on those parts and reduces their lifespan.

As to shift times, stock calibration should for WOT have no delay times where part throttle does

Do a part throttle test from a dead stop and then repeat that with WOT and judge the two and then determine how much delay between shifts you want.

Best of course is to use a OBD-II scanner in record mod, recording PIDs such as RPM, MPH, TPS angle, delievered torque and trannie PIDs for each gears shift times and from that you can dial in the PCM values

Due to age of trannie you could try by reducing stock PT shift times by 30 percent and then allow PCN to adapt with some drive time before makeing a judgement of results.

Keep in mind the more TM is reduced also reduces traction control and wheel hop along with the abuse to torque converter and of course internals of A4

TM at times can be smarter then the driver and at times it is better that it is reducing timing rather then rear tires losing traction.