I have a propel sky master 1540 should there be much free play between the prop and the cone shaped capI find when I start the props I hear it pop the props are pushed up against the cone and make a clicking noise is this normal or should there be less free play between the prop and the bottom. I also find that after I get the props moving and take off then when I descend slowly and land I still have two props spinning very slow. There is not trim adjustment to compensate for this. Any help would be appreciated. I have done the calibration correctly . This drone has the camera as well