Your not going to stabilize any F1 parring by cubing the parents......
Trust me here. you want phenotypical diversity. If you don't have the space or time to run the pheno's to see what you get.....why breed.
The number of pheno's from a crossing can be diverse or small. Had one lately that had what I thought was 9 and now has turned out to be 10 differing pheno's from the first 36 beans popped......One might be the holy grail pheno.
Lets look at Ghost "cut" OG as an example. It has a pheno that grows 2x faster (height wise) then the "normal" market pheno. This also has a more sativa look to it and the buzz just sends you
SOARING off into "I'm so fucking HIGH" land vs the normal - half sphere shaped OG pheno that you get all the time.
The "Magic carpet" pheno is rare, maybe 1:100 beans pops this pheno.
So, be diverse and run like 24 fresh beans together to make a quick picture of the pheno spread.....maybe, just maybe, you'll find a winner, winner, chicken dinner pheno!
Um, most likely not with that cross you exampled.