I noticed, that Space belts get sometimes bugged and for some reason dont output 100% saturation. This happend for example right after the miner so no bottleneck was in the middle . After deleting the space belt and recreating it exactly the same way it fixes the issue. Also noticed that sometimes with regular belts that identical factory blueprints, most of the time you get 100% belt saturation and sometimes like 90%-95%, deleting and recreating the same setup fixes the issue so not sure if its specific a belt issue or a shape processor.
#[0.0.7] Space Belt belts do not always have 100% saturation.
orchid zinc
lone skiff
Fixed in 0.0.8 ( #✨updates )