Not 100% sure about the math as its been awhile since I last re-arranged a formula, but from your figures TT I make the DSG drive ratios:
1st, 4.51
2nd, 2.88
3rd, 1.89
4th, 1.41
5th, 1.09
6th, 0.92
I have used the following to calculate this, gear ratio equals tire circumference x engine speed divided by road speed equals gear ratio.
So with your tires 25.4 inch circumference divided by inch's in a mile = 0.0004008 miles per revolution
engine speed RPM x 60 for RPH = 180,000 RPH
0.0004008 x 180,000 = 72.144
divide this by vehicle velocity provides the gear ratio, and they seem to tally up with the miss print from VW with the 5th and 6th ratio's matching.