Settle at 0.5 pixels for 30 seconds sounds pretty stringent (though without knowing your guider image scale we can't say for sure). It means the guider error must stay below 0.5 pixels for at least 30 seconds. If the guider exceeds 0.5 pixel error, the timer starts back at zero.
To get a more permissive setting you should increase the amount (pixels), and / or decrease the time. For example, settling at 1.0 pixel for 10 seconds would be a lot easier to achieve. You should look at your peak and RMS error pixels values on your PHD2 graph and choose values for settling based on what you see there.
Hope that helps.