Crankshaft Seal Help Requested ASAP

[Dr. Ian McArthur]

I am changing the crank seal on my 5TQ (for the second time!).  The first
replacement a month ago leaks more than it did before.
I have the proper special tool.
I have two genuine Audi seals that are the correct size according to SJM.
The problem is one seal has a single sealing lip, the other has two sealing
lips.
The old one had one sealing lip.
The question is which one do I use: one lip or two?????
Also any ideas why the first new replacement still leaks.

I am taking the car apart as I write


Thanks in advance.

Ian