Setup last night briefly and polar aligned via sharpcap and got GOOD showing error of about 1arc minutes, then ran phd 2 calibration then guiding assistant which said a pa error of 14 arc minutes so I thought I’d try Apt polar align feature paps = polar align via plate solving the code required being kindly permitted by rumen Bogdanovski from the INDIGO project and have to say I’m impressed using a three point alignment after running phd2 calibration and GA got down to 1 arc minute, best calibrated low at the celestial equator which I was , I probably won’t use sharpcap pa from now on as that seemed far easier using the main camera , also handy as you don’t need Polaris in view which some people don’t , there is a few settings to tweak if you want as you can do auto for motorised mounts or manual for tracker mounts , more info in the APT manual https://www.astrophotography.app/usersguide/polar_align_via_ps___paps.htm but if you use APT and have ASTAP setup and configured in Apt definitely worth trying , just make sure you have blind solve with Astap ticked in platesolving settings .