All (as nepechalno) repeat Chinese oshibki- place shagoviki on screws directly.
The Chinese this make for declining sebestoimosti- this is logical, but only on khobbiynykh FVC.
Where you saw industrial looms with such Central. I not mean servy and the drives with compensating resonance.
Increasingly unless in resonances, for shagovogo dvigatelya- this "death" The longer than the propeller those Drebezg more. So you big speeds not arrive at nor stop more a powerful engine nor the drives.
Check a tick belt 1 :1 and you will feel difference.
I even on axis Z put belt and there is no problems. Someone puts connected, thereby are pushed back, resonance, but think, that connected help from passes steps.
For your press enough engines 18 kg.