assuming this is true, perhaps it's best to freeze sperm regularly with labels that way if you go off the deep end you can snapshot quite literally your best self? some possible times - right before college, right after college, after you meet someone you think you'd marry (but before you do), after marriage. seems like a neat premise for a sci fi novella.
I think trying to "tune" your kids in any way is asking to be disappointed. My three kids could not be more different and they all have the same mother, grew up in the same house, etc. If "microRNA" profiles have any influence, I would wager it's very small.
> No man ever steps in the same river twice, for it's not the same river and he's not the same man