Hi All.
Pete,
Not a Guru yet!
There is a driver for the Meade Mounts that has been modified to enable "Pulse Guiding" on the Stark-Labs website.
http://www.stark-labs.com/phdguiding.html
1/2 way down the page.
Reports are that this makes the LXD more responsive.
I had to increase my "Calibration Step" setting to between 950-1200 ish for a smaller scope.
What software version of Autostar are you using?
Let me know if you need anything else.