beat "dis" grid

I'm prepping for my first DJ gig (and probably only) of the year. I seem to do about one a year since I quit playing out actively back in 2005... anyway this is the first time I'm doing a digital DJ set. The software I use is M-Audio Torq, and prepping for this set, I've made some interesting observations in terms of the beat-grid and prepping tracks. I assume there are slight variations among Ableton and Traktor for example, but I believe this applies across the course for track preperation 1) 4/4 and breakbeat tracks purchased from a DJ download store tend to need almost no alignment, other than moving the beat grid a slight nudge after initial analyses. 2) working with tracks that have been recorded from vinyl is a different story, but in a bit of a bizarre way: we assume some wow and flutter when encoding from vinyl, but certain records are almost dead on and need only 3 or 4 anchor points (warp markers in ableton), while other need one every 4 or 8 beats. Its bizarre, and all the records were encoded from the same turntable on the same day. we can only summise.... 3) I have electro records that were recorded directly from analogue drum machines. I am assuming then that these machines do not keep perfect time, as I had previously believed. The only other factor might be warped records..but non of my vinyl is warped. 4) live drummer tracks are next to impossible to get right, you simply need too many anchor points and once you do that, it instills this wierd sound that destroys the organic feel of the original record "vibe" Related: DJing exclusively in the box;