Lets start with first things first. I noticed you said that you checked the alignments and they were within a couple of thousandths. Start there. This is way out of Okuma spec. I am assuming you are talking about the Incline and Parallel adjustment of the turret. The Okuma spec is 20 microns which is less than a thousandth. This is for both checks. The first thing that needs to happen is get the turret properly aligned. You will need a good coaxial indicator to sweep in the turret for the X alignment and zero set. Check the Parallelism first. If this is out then you need to adjust this first as it will change the Incline if you do the Incline first. It may also be that the Headstock is out of alignment. This also must be checked. I would recommend starting with these alignments first as this is what a service engineer will check first if he were to come out. Again the tolerances are 20 microns but you should be able to get them pretty close to zero which i would recommend when drilling or tapping. Most times these adjustments are the culprit when breaking drills or taps. It certinly could be something else but you need to start with these adjustments first.