Many club matches are short range, basically pistol matches with a long gun. Those are ok with 1x. Stick with those, fine. However, I just shot the Larue match - out to 440 yds. Set the 1.1-4x to 4x for that one.
Just a note - Having a scope and a dot will put you in Open division. It is possible to add open sights on an angle mount, and stay in Tactical.