Having looked around the mod portal, there's a handful of different space science recipe tweaks I like, but none of them are my platonic ideal:

For 10 science packs (instead of 5):
Made in Centrifuge
15 second craft
2 Iron plates
1 Ice
1 Carbon
1 Uranium-235 (returned 80% of the time, lossy catalyst)

The u235 consumption (1 rocket launch for 1000 science) is the rate mentioned in FFF #381, and the doubled yield is to compensate for centrifuges being slower and having fewer module slots than assembler 3s.

I know it's a lot to ask, but would you consider making this recipe possible through mod settings, or perhaps releasing a fork that uses this recipe?
Totally understandable if you don't feel like doing either :)

I agree that the yield is too low in the late game. I don't have an issue with a return chance, i can give that a go. the other thing i was thinking was using the empty fuel cells as a potential way to increase that rocket capcity and have the emptying of those fuel cells happen in space.

Would that be a cool idea?

That would definitely be an interesting take, though I definitely like big kovarex setups being required, and launching fuel cells would effectively be launching 1 u235 per rocket instead of 20.
Also, I ended up experimenting with forking the mod myself and did manage to get it to work correctly as a chance-based catalyst :)

I just always really wanted to use the empty fuel cells for something you know. They are a unique item. Processing a rocket stack of 50 becomes 45 uranium-238 (with 50% productivity in centrifuge). which converts 45 into 675 science with one rocket launch. So what you are proposing is if the recipe made 15 science instead of 10 science. one rocket lauch of empty fuel cells would make just over 1000 space science.

this means if you had 200 reactors burning fuel on the space platform, you would be making an empty fuel cell per second. (4.5 uranium-238 per second) (101.25 space science per second)

not gonna lie there is something cool about end game space science becoming a giant reactor sattellite.... all my mods are about trying to make nuclear more integral for the progression. start by sending some small amounts up, for low science or mid game science. but late game you need a floating reactor to get a full green belt. while all your space ships have converted to fusion reactors, the OG space science satellite is a crazy unique build.