In my case, no 2-1 slam... but there was occasionally slippage going from 3-4. Since it was my last chance to have my friend, RIP Robert, help me, we did all the solenoids as well.

As far as how much goes in, I left mine to drain for about 3 days, plus drained the valve body, and got almost 8L back in, using my MityVac 7201. Super fast, clean and simple using the side port... but that may be a little extra, as has been noted elsewhere. So far no ill effects in about six years doing it that way (twice with Valvoline MaxLife red).

How did you reset the adaptions? As I think wpoll pointed out in the other thread, you can't do it with the ignition-accelerator method. That may have applied to older BMWs.