Steering wheel is shacking when returning back to dead zone

Hey everyone! I notice this issue since about a year on my 16 sport but it is now much more heavier. It occurs only when the steering wheel is free of tension and comming back by itselt to the central dead zone WHILE RIDING.Either from left to right and from right to left. It shakes like unbanlanced wheel but slower. The shaking beat is alway the same is not proportional with the speed I ride. I ride 5100/ 887. What could it be ??? Thank you guys

 

Could be a lot of things. Warped rotor. Front end alignment. Bushings.

 

The rotors and pads have been replaced a month ago and the issue and still there with two sets different sets of tire/wheels