I was joking - sort of.
You say your pull like a bull till 4500. While it does continue to pull, I found you actually wasting your time.
I found best on my A3 is to change around the 3750-4000 mark. This brings you nicely into the torque on the next gear.
More pull down there than up at 4500.
Just my 2c, sorry, 2p worth. 
Cheers,
Crispin