What's the intent? If you want a random global feed, you should probably read from more relays - keep one or two free relays ( try nostr.mom or nostr-pub.wellorder.net ) in addition to the paid ones. Ensure you toggled global on some relays in common with the people you follow, so that you don't miss their notes.
There's no optimal configuration - it's trial & error based on who you follow & what you want to see.
Some clients have friends of friends of friends feed - that can be an alternative to global.
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