Not sure what units PHD's RMS is in there, Andy. But if arcsec, then I'd be happy with the 0.56 you're getting!
Even if that's pixels of the Lodestar (which I suspect it might be for PHD1 - I use PHD 2), that's probably still around 0.6-0.65", which seems still OK for an EQ6.
I also have an EQ6 (and an RC8) and on a great night (very rare!) I get around 0.5" RMS for periods. Typically it's more in the 0.6 to 0.7" range for a good to medium night. And can easily push higher than that with anything more than a gentle breeze.
And when backlash rears its ugly head with a nasty gust of wind or two, it can be many arcseconds!!
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