The eccentric nuts purpuse is exactly to do this. they rotate but dont “tight” they snug the wheels UP or down
The way you have it set up its a bit tricky you have too much mass above and below the attachement point
There is something you can try, which is a try only, add mass to the back to counter balace it. like balaster
Heres the main problem
One is trying to fight 3 “deamons” at once
You bought a more powerful module to gain speed
But by its specificities the module needs to be held Low
So you are fighting physics with physics, which is a whole can of worms
Would be slightly counter productive to have a more powerful module, but ending up to move slower because the physics.
I would first of all remove the whole 3d printed part, and attach the module bare
LIft the material to the module.
Is this better?
If so you might have to compromise on your lifting mechanism
You might have noticed most brands make them simple and limited, for a reason. Not necessarely because its “cheap” but because mass causs the problems you are facing.
Think Co2 machines. the head is made as lightwaight as possible too for this very reason