I refer to this as stacking or layering.

Not proper nomenclature but you will notice I will either breed a traditional line F1-fxxxx this is a committed traditional direction. 

Skunk From Scratch for example I bred:
Acapulco Gold x Kabul F1, then

Then Santa Marta Colombian Gold X Kabul

Then I crossed SMCG x Kabul x AG x Kabul .

And the opposite.

Once I get what I am looking for I will inbreed the line for stability. The only way to really understand inheritance is to run the strain. Certain strains pass on dominance fast and easily from a male like DJ Short's Blueberry, it passes so much from the male side in a F1 it can be a shock.

Other strains it can take a double BX to the male to really get noticeable inheritance from the line. Certain strains that are totally elite just don’t fire with many strains you hybridize with.

But for clone only, I will always start with an outcross and BX and check inheritance.

I like strain like G13 because they tend to not interfere with the terpene profiles of what I outcross, while adding flower density and reducing stretch (for example).

Hazes are all about finding males that pass on favourable traits. It’s funny I spent so so much time on Skype with Nevil.. And we talked about all kinds of stuff but we didn’t talk much about breeding Haze even though it’s what we were doing. Recently I was reading how he said don’t inbreed the O-Haze line haha something I had also figured out but we never discussed. I had to spend time breeding a male line for my Haze work every great O-Haze female I found would fall back to common denominator as soon as I used a O-Haze male.

It’s why Nevil used NL so much and others.