2016 Jazz Blue A8 Scat
The car will accelerate more quickly with the converter LOCKED under 99.9% of circumstances so don't bother messing with any gears except first. Your shift recovery rpm from first to second will be well above stall speed with the 8spd trans.so setting it to 10,000 for 1st through 4th, it would no lock up until 5th gear correct? need to see what the lowest gear it is in when cruising at 35mph and enable lock up for that gear. Just using 35mph as that is most city streets and would not want slippage (heat) there.
The only exception is in first gear during a launch below the stall speed. Above converter stall speed, the converter has very little slip anyway (hence stall speed) and there is nothing really to gain, but you will have frictional losses and generate heat.