I guess my point is PHD2 thinks it has completed the dither and reported settling has completed.
When you watch the PHD2 graph you will see a 'dither' command being sent when dithering is sent.
Are you noticing streaks in your images?
Either your mount is very good and it settles that quick or all you really need is to enable that delay option I have mine set for 3 seconds. But mine is for <.4 pixels, as I found that worked best for me, if I was at .2 pixels it would probably take forever to settle.
Do you have the correct focal length / pixel size of your guide scope /camera setup in PHD2 correctly?