Well.........call me hard headed to some extent.

I practice linereeding, inbreeding and outcrosses. Understand what I consider the basics ....minus the docterate degree in physics.
Every single great dog I have witnessed came from two other great or extremely good dogs.
When something solid is bred back to trash or second best. That's exactly my expectation for the litter......"Lacking"
When you decide to make a cross off of a math calculation instead of the individual dogs productivity ......think you are straying from what your ultimate goal should be.
But as always .......to each their own.

Fully agreed. Keep it tight, but still don't accept subpar