yeah i knwo it's so hard. but i'm managing. currently i have 2 redhead females and no red head males. Well maybe my ideal range is dirty blond to light brown. I have a main guy who I try to father all. and I try to match him with girls with same hair color but with the range the first red head is one below perfect average.
Acording to Complexity's gentics guide my ideal male and female head is 21 so if i have a 21m and a 21f there is the chance of a 20f/20m aka redhead.