It isn't possible to put a number on deductions without it being arbitrary. The 148k number was a generalized number for a specific tax bracket based upon expected earnings on widebody FO's in HKG. That's all.
You are absolutely correct that deductions will change everything, hence why the generalization. I wanted to point out to people that the tax equalization is not as bad as portrayed and can be very effective if used correctly.
In my opinion, you can't expect Fedex or ALPA to give you any advice regarding your personal tax situation because it is simply not possible to give you an accurate picture due to the millions of variables involved on a case-by-case basis. I view any tax advice from ALPA or Fedex as a complete liability.