[Geof]

You do understand, it is necessary to reset the tools for a new workpiece. As far as possible I leave basic tools in the turret and once the X offset is set I do not touch it (unless I change a tip making it necessary to tweak slightly}.

Z offsets I set for each job just by taking a facing cut with one tool and then touching all the others off against that face. Remember this is with a four place turret in a TL2 so very often I am changing tools between jobs and then I have to do both X and Z.

When you have more tools and are likely to leave them in place you approach of having a fixed reference point and then moving everything with the work offset is probably easier.

You are correct about off-center taps not being a good thing so it is worth finding the best holder and reserving it for taps. Incidentally you need to check the alingment with the spindle axis also because the Haas holders do have some slop when they bolt on and they can droop.

Drills it is hardly worth bothering about because all it means if the drill is going to rub on the lands and make a tapered hole which is likely going to be bored larger anyway.

Reamers you should be using a floating holder to accommodate small amounts of misalignment.