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If you are using pulse guiding with an EQdirect cable instead of ST4, PHD2 will pull the guide rate out of EQMod. If you change the guide rate in EQMod then PHD2 will ask you to either change it back or recalibrate.
I always run at 0.9X rate in EQMod, I did not see any particular difference when running it lower, In RA it is not important as per info above, a guide east pulse will run the mount at 10% of siderial rate, so you don't really move the scope east, you just slow it down and wait for the sky to catch up, tat means it never reverses. Unless you have very little dec backlash I have always considered the highest guide rate to be best so that backlash pulses if the direction reverses are shorter. If you have a 1 second backlash pulse at 0.9 rate then at 0.5 it will be nearly 1.8 seconds just to take up the backlash. I am not sure if PHD2 deals with that by waiting for another exposure before moving again or not.
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