I have housed all my Rough Scaled sand boas together for years and have had no problems.
Though this year I housed my two males with just my biggest two females as opposed to my dad just housing my colony together by who has eaten this week and who hasn't.
On a side note I have seen my normal colored male breeding the two girls for the last 30 days pretty solid while my high white male deosn't seem interested in the girls. At least this year I will be pretty sure who the sire is going to be.