Hello Javier. I think you started this concern on a different thread but it's kinda the same subject.
So here's your solution, again:
Change your phone.
The DJI GO 4 is not choppy with the Mavic Pro; they were designed to work togeter.
Anyone can try to fly the aircraft using a cell phone (even your IPhone 6) but it won't give provide you the a live feed at it's best. (Hence the reason of that "delay" on your videos, and the distortion on the image. )
So, if you can try to get a tablet.
I had the same deal a few weeks ago; even spend countless hours with DJI Chat Support and all the help everyone provided me here, and at the long run it was my phone.
I just wanna save you time and even money; it's not the app, nor the Mavic.
It's your phone...