doesnt keeping the hips low change the lift in technique completly?
It does. If your goal is to start the lift with your hips low to use more legs, don't pop your hips up before the bar leaves the ground. All that is happening there is you start, then move your hips up into a higher position, then start the lift.
No matter what your goal is with the lift, the movement of the deadlift must start with the head and shoulders, not the hips.
All lifts have countless ways of being done. Deadlifting with the hips low and the hips high are two different types of deadlifts.
If the goal is lifting the most weight possible, you want to start in the position where you are strongest. It will be different for each person. It will not be with the hips really low.
My hips are really low because I always wanted deadlifts to be a leg dominant excercise
Why??? There are many lifts better suited to being a leg dominant exercise that may be a better choice than the deadlift.
I beleive when someone has hips high they use most of their back.
Starting with the hips higher allows better use of the much stronger glutes and hamstrings. Yes back is used during the deadlift, but it is not the muscles that are responsible for completing the lift. The back, no matter how the deadlift is done, is only an avenue to transfer of strength from the hips and hamstrings, through the upper body, to the bar. So it is very important, but again, not what is causing the movement in the deadlift.
So should i bring my hips higher, or stay at the same?
This decision must be made by you. I would say yes, because you are not starting in the strongest position possible.
Though if your goal for the deadlift is not to lift the most weight possible, then other types of deadlifts will be useful.