If you can, try them in a cup that has a press-fit for them...no foam or rubber between them and the cup (this is hard to get sometimes, and I use thin strips of electrical tape if I have a hair's breadth to fill).
From memory (my first V6 build was a pair of press-fit cups) this should make them more neutral. Not as neutral and transparent as the Ypsilon (again, from memory, could be wrong, and as always, YMMV), but more than the foam/rubber mount.
Sorry for all these questions but how are they with Flats?