In your first post you mentioned you were using aperture priority and I'm wondering why you choose to use aperture priority.
When approaching any given shot... think about what sort of shooting constraints you have and this should suggest to you when it's best to use shutter priority vs aperture priority.
When shooting action and the goal is to freeze action then consider using shutter speed priority and set an adequate shutter speed. (e.g. 1/1000th or faster). When you meter the shot, the camera may warn you that the lens aperture required cannot be achieved using your lens (e.g. if it wants to use f/2.8 but your lens won't go below f/5.6 when zoomed in) but that would serve as a hint that you'll either need to crank up the ISO sensitive (causing more noise) or you'll need a faster lens. You could revert to aperture priority, set the highest ISO you can stand, set the f-stop to whatever wide-open is for that lens & focal length, and then take whatever shutter speed it's giving you -- but you'd know it's not _really_ the shutter speed you want... it's what you have to settle for.
In boiling it down: If shutter speed is the all-critical thing that makes or breaks the shot... then use shutter speed priority.
If shutter speed isn't important... but perhaps depth of field is... then use aperture priority.