Again,
How are you checking for alignment? If you are checking for alignment
parallel with the miter slot, make sure you use the SAME spot on the blade
for the front and back measurement. Mark the blade with a sharpie and take
a measurement in the front then spin the
blade positioning the sharpie spot in the back and remeasure.

What are you using to make these measurements?

--
Stoutman
www.garagewoodworks.com