however my questions is how do i get the flex out of the x axis in the center,
The simple answer is you can't.
What you have is basically a toy.
Plastic wheels running in extrusion slots will flex.
Extrusions themselves will flex.
Tiny belts stretch and flex.
Then, when people try to upgrade them to make them more rigid, the weakest part flexes even more
These machines are designed to be easy to build and be inexpensive.
Learn to work around it's flaws, learn the process, and move on to a better machine.