If you adjust the front brakes by the book, ie just dragging and then back off the adjuster a notch or two in my experience they will almost always pull to one side, a few years ago my MOT tester allowed me to play around with the adjustment whilst the van was on the rolling road in the end I managed to get 'em 100%
Try this, set them as above and roadtest, if the pull towards say the drivers side then slacken off that sides adjuster a couple off notches a road test again, keep going until everything feels ok, up on stands my van has one wheel rubbing slightly the other side is 8 notches off dragging and spins completly free but the brakes work perfectly!
tigger