wobble in GPS mode

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New here, have a used Phantom 2 vision + that needed some work to it, ie 2 new motors and esc boards, after work was done and all soldered good, it now takes off and seems to twitch in GPS or hovering, 1 motor also seems to be somewhat "tighter" then the other 3 as it stops spinning sooner then the others when shutting down, any thoughts on what to check on this and thanks.
 
New here, have a used Phantom 2 vision + that needed some work to it, ie 2 new motors and esc boards, after work was done and all soldered good, it now takes off and seems to twitch in GPS or hovering, 1 motor also seems to be somewhat "tighter" then the other 3 as it stops spinning sooner then the others when shutting down, any thoughts on what to check on this and thanks.
do a IMU CALIBRATION. YouTube has a video I'm sure.
 
Ok, did multiple IMU calibrations, all come up with not needed info, did anyway, so good there, still have a somewhat twitchy flight when in GPS mode and hovering in one spot, when moving(flying around) no problems and motors sound fine, should I be concerned about something else?
 

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