Your precentages are double what they should be.
Het X Het gives per egg:
25% visual
50% het
25% normal
This is also how you get your 66% hets because every 2 out of 3 normals resulting from the clutch should statisically be hets.
Good luck breeding you hets.
Here is a good calculator for BP morphs: http://www.worldofballpythons.com/wizard