excellent results Suavi - what bit of 0.45 arcsecRMS did you want to improve/change?
I presume that you have already tuned the phd2 parameters to your mount, but some comments:
- you seem to have a very slight residual PE that might possibly be reduced by a bit more agression in RA and possibly smaller min motion
- you could maybe also try a shorter guide exposure and/or higher guide rate (eg 0.8 siderial) to tighten things up around the noticeable PE zone.
- I don't know how you have the mount supported, but a solid pier can help in reducing wind/turbulence vibrations
these are just a few things to try, but you really don't need to do anything - that is good tracking for any mount, mass produced or not. I assume that it is producing round stars.