Thanks for playing!
If I'm understanding you correctly, then this is the intended way to play! You need to balance setting, for example, 4 attack and 2 boost, which gives you a 4/6 chance for the roll to land on attack, or setting 2 attack and 4 boost, which gives you a 2/6 chance for the roll to land on attack. The 2/6 attack will be much stronger than the 4/6 attack, so you're balancing whether to opt for a strong attack or a more probable attack. You also cannot set 6 of the same actions, so there will always be an element of chance. Hope that clarifies!