Thanks, Zermelo, for taking the time to post your configuration. I am getting closer but still no cigar yet. BT4 is 2.6.28 and I also have Ubuntu with a 2.6.26-5 kernel ... probably too different from your 2.6.27 kernel for the compat version to work....so may upgrade the Ubuntu kernel and give your combo a shot.
With the BT4 and the new svn aircrack-ng 5232 version, it looks so close. Had all five aireplay-ng attacks going at once (-1,2,3,4,5) and all of a sudden, the airodump-ng burst into 300#/s......so this must be close but not smooth at all.
But, what the heck, that's the fun of it! Testing.