I am speaking from using the extended VI versions of the libraries so I don't know if you have the same set of samples. I like the various levels of dynamics found with "Light, Medium and Strong" cresc and dim because they give you a lot of options. For example, the attack on a light dim. sample in a lower velocity may be very crisp and clear but not real heavy. Like a mezzo forte going down to piano. I sometimes have alternated those with the sforzando in order to use a clear, strong but not too loud attack.
Anyway it's a very ambitious job to do Bruckner and it is very cool you are doing it.
Now you've got me thinking about it as well as whistling parts from it. I love that symphony and remember playing horn on it at a concert once. All the brass players loved playing it - so many great parts in Bruckner. The Adagio is so beautiful. Composed after Wagner died as a tribute.