Andrew, can't help you with the lubrication as both mine, 4:1 and 6;1 have spring loaded oilers but they aren't Tapmatics.
However think you might be interested in the way i have mounted mine.
Usual Int 40 taper but i have repositioned the homing switches on the Z so the quill sticks down 1/2" all the while, there is a clamp fits to this that hangs down and a pin screws into the tapping head to do away with the floating bar that sees to foul everything except stopping the head rotating or knocking paint off.
Mine you as i type this I realise you have an ATC and no quill ? no what I have done may not apply in part to you ?