If you only have scout players, how could you be beaten honestly? Especially I am certain your opponents are way weaker than you. There's nothing to do with best tactics or not, as there is no best tactic. In this case you can also play GK-DC-ST-ST-ST-ST-ST-ST-ST-ST-ST or GK-DC-DC-DC-DC-DC-DC-DC-DC-DC-ST it won't change anything.

How many seasons have you played?