Sounds like progress. Must have been pretty tight if the disc brake was slipping - was this with all 4 wheels on the ground?.
Also after finally tightening up the driveshaft nut did you check the wheel was turning freely? Admittedly this is not so easy on the front wheels as there is the drag from the diff.
Well doing it up to 270NM is pretty tight, even with brakes on.
To be fair, even Mr Haines mentions you can make a tool to hold the disc from moving.