weekday prices are generally cheaper than weekends, do you have any specific dates in mind? or is price the main factor

keep in mind tango fares only earn 50% status miles and can't be upgraded (two things the majority of us care deeply here) so you might not want an E fare since you're AC E, though tango fares in december seem to be less than half of T+ so maybe there's a promo at a rival airline for this route?