I'm having a lot of problems using EKOS and external autoguiding in PHD2. If I enable DEC guiding mode as "Auto" I always get a graph like the attached one. At first, it goes well but when a north correction pulse is done, the DEC red line goes down wildly.
Instead of that, if I only change USBs to my Windows laptop and start ASCOM + Cartes du ciel + APT + PHD2, the graph is perfect, as seen on attachment.
This is my equipement:
Mount: Skywatcher AZ-GTI + Star Adventurer wedge + serial cable
Main tube: Skywatcher Evostar 72ED 420mm + Canon 550D