You say that the distribution of matter doesn't change the form of the deformed space, but you don't say why.
I don't even know what this phrase means.
I may not understand the quarks the way you do, but you explained they were the first massive particles, so it means that they belong to matter.
They are the elementary particles that forms nucleus; so, in that sense, they "belong" to matter; yes.
Their mass-energy deforms space, and it is the addition of their small deformations that produces the big deformation that holds galaxies together.
Not exactly. It's mass energy that deforms space and it's the addition of mass energy that produces bigger deformations. My fingers write my phrases but it doesn't mean that they think what they write.
Since there are more quarks where there is more matter, there is necessarily more quarks in the middle of galaxies,
Wrong. In the middle of a galaxy there's a black hole and there's no quarks or matter in a black hole. There's only mass energy.
thus the deformation of space is supposed to be more important there, and you kind of say that it is no more important than the one situated in the arms since you say that it can explain the speeds that we observe there.
So according to you, there's more "speed" in the arms of a galaxy than between the arms? You don't make sense at all. What does this phrase mean exactly?
To produce the same orbital speeds, those quarks should probably be situated where dark matter is supposed to be situated, not inside stars.
All those stars are installed in the greater space deformation of the galaxy. Each of those stars have their own space deformation around them, which orbit inside the great galaxy space deformation. And around these stars, orbit planets surrounded by their own space deformations that travels inside the bigger star deformation.
All those space deformations are produced by the pressure of each object's mass energy on each their center of gravity. Only matter in contact with the object
can add pressure to the center of gravity in order to deform more space around the object. There's no relations between independent space deformations of each levels; but the levels are contained one inside the other from the smallest level to the greatest level (nucleus -> atoms -> molecules -> organisms -> moons -> planets -> stars -> galaxies. They are all surrounded by a "halo" (balloon) of deformed space.
That is the only "halo" existing around matter; and it's not "dark matter". It's only "deformed space"; and it doesn't has any effect on the speed of whatever is orbiting inside any deformed space. The orbit of an object is decided by the speed of the object and it travels where its speed corresponds to the orbit depending of the distance from the center.
These are "facts"; so whatever doesn't corresponds to our formula only means that the formula is not exact or could even be all wrong; not the "facts".