The film was indeed kept stored in the freezer, but another tri-x I shot a couple of weeks back did not have any particular issues (same batch from some left overs that came with the camera I bought, exp date 01.01.2011).

I'll keep trying a bit and if not, then try Ian's tip.

I'm already spooling from the "best" side of the film, the other end is so curled that I cannot even straighten it out to mount it on the spool at all =)

- Getting a nasty, sinking feeling each time the b*stard slips and forms this icky bunched up mess ^^