Problem is not you are not using glute max.
Problem is that there is a dysfunction in your glute max or your nervous system chooses not use it so other muscles synergically dominate.
Stop beating up your glute max by doing exercise.
it will not let u use more glue max than hamstrings.
Your nervous system controls which muscle to use as domain mover, and if there is something wrong in your glue max, then other muscles are recruited. Stretrching hamstrings are not gonna help you
either. your hamstrings get tight because it is overused because your nervous system choose to use as main mover.
I would recommend you do lots of Glute max and medius stretch rather than beating up those muscles and atso stretch for quads.
your hamstring maybe tight because your body try to prevent some other structure to get injured. if thats the case, stretching or treating hamstrings will put you in worse situation, Injuries
your hamsring can get tight if your quads are dysfunction and you use hamstrings for prime movement of siting and standing(squat type movement)
My conclusion is that
trying to Fire up muscles that are dysfunctional is NO NO. it is making it worse really, and most of people do that way.
we need to train reflex to fire up wanted muscles after the treatment is done if necessary
but most of cases, it is not.
your body(nervous system) knows that it is safe to use glute, then it will use it.
Sometime your body is not convinced that there is an enough treatment is done, then you do fire up training to convince your nervous systems that it is safe to use that muscle as main mover.