Ekos - ZWO EAF - Newtonian, what are the best settings?

[AstroRookie]

Hello,

after weeks of rain, finally able to use the ZWO EAF I got for my birthday from my kids. I looked around a bit and these are the settings I'm using - "as we speak" - with Ekos and my Orion8 newtonian:

• Settings tab:
  • Full field: checked
  • Box: 64px
  • Annulus: 25% - 80%
  • Settle: 0
• Process:
  • Detection: SEP
  • Kernel size: 5
  • Sigma: 1.5
  • SEP Profile: focus default
  • Algorithm: Linear
  • Tolerance: 5%
  • Average over 2 frames

When I start the automatic focus process, it starts far out (or in), with donnut-shaped stars, at some point it reaches (imho) nice focus but continues and stops with donnut shaped stars. I've read somewhere that with a Newtonian it's not easy to use an automatic focus process, due to the secondary mirror shadow when out of focus.

Can anybody please advise what settings I can use for my setup?

Thanks and kind regards,

AstroRookie