I have an AP900 mount and use the AP APCC software to control it.
I cannot get SGP to plate solve correctly and I always seem to by off by about 10-15% of the Width/Height of the image in both Dec and RA. Luckily I bookmark my star guide position in PHD2 and can manually return to the same position.
I have tried to change to J2000 in both the SGP Plate solver parameters and in APCC but still no luck.
Can someone using APCC and an AP mount advise on what the settings should be in APCC and SGP?