Constellation 8K and Sync Generator Issues

Can please anybody from Blackmagic tell me, which setting I should choose on the Sync Generator when the Constellation 8k is set to 4K 25p?
I tried so many settings, but I have really unstable results and image flickering.
Connected to the Constellation:
- Studio Camera 4K Pro via Studio Converter
- Web Presenter 4K
- 2x Hyperdeck Studio 4K Pro
- HyperDeck Studio HD Mini
- and a LED Wall controller
Thanks a lot.
I tried so many settings, but I have really unstable results and image flickering.
Connected to the Constellation:
- Studio Camera 4K Pro via Studio Converter
- Web Presenter 4K
- 2x Hyperdeck Studio 4K Pro
- HyperDeck Studio HD Mini
- and a LED Wall controller
Thanks a lot.