To tap that thickness without a chip clean move ( or three) would be equivalent to tapping 75 mm plate with a 24 mm tap without stopping to clear the chips. You can program two or three G84's in a subroutine to provide the chip break and clearing.
You would be better off to use a seperate tap with a spiral point (for a through hole), or use a cold forming tap.
For deep threaded holes, you are usually safe to increase the tap drill diameter just a whisker, in order to make it easier to cut threads. Unfortunately, the DRAP locks you in to a process with very little flexability.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)