Wow, that is strange! I have a dPX folder with a D2 tool steel blade and it took a beautiful edge with no such difficulty.
When you were seeking the burr, were you using a scrubbing, up and down motion with the paddles or a sweeping motion? In my experience, I have found that the up and down motion is the way to go when raising a burr,especially on tough steels. And I have also found that during this step is the only time when some fair pressure on the paddles when scrubbing, is a good thing.Try the scrubbing motion bearing down somewhat and see how that works for you. Please post what happens.
Good luck
Leo