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Can I suggest the following settings.
Set the pulse length between 300 - 600 ms - whatever it takes so it calibration takes about 25 pulses to move the star initially far enough - then always use this setting.
Use a aggressiveness between 70 - 90% (I haven't mastered this one yet myself).
Try several runs with aggressiveness say at 80% with minimum pixel before a pulse is set to 0.7, then 0.75, then 0.8 etc all the way up to 1.3 pixels
Keep the image refresh rate up to around one update every 2-3 seconds if you can - this seems ideal for me using a Meade DSI (mostly with an 80mm refractor). If you are updating 60 times a second - you will being seeing a lot of atmospheric turbulence.
Try the latest version of PHD - 1.8.3, enable logging and see if drift looks both balanced in all axes directions (indicating good polar alignment) and smooth vs jaggy (indicating fewer seeing or over correcting errors).
Hope this helps!
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