As they were different cultivars it’s maybe no surprise their seed maturity ratios are different, each specimens having a different maturation/life span.
In this case, I guess to optimize the amount of nice seeds on each specimens, you would have to enter them into flower at different times, to sync their peak of readiness to produce them, when the male is itself at its peak of production (cause I guess they have one too, why wouldn’t they?). Almost like staging their entrance to their level of NLD blood/harvest date. If you’re using multiple males, you’d probably have to do the same dance with them in an ideal world. 
@Magu DD spread that here and there but it’s summed up here Freaker’s Ball Preservation Project 2021: Arakku Valley - #232 by DougDawson