I was wondering if you could please add a configuration setting for the wagon and storage tank changes. I’d personally like to change it to +10% per level as it currently feels too powerful.

Also, are the rocket silo changes compatible with Rocket 100 (makes rocket require 100 parts and increases crafting speed by 50%)?
https://mods.factorio.com/mod/Rocket100

Rocket 100 should already be compatible - they make their changes in data-updates, so the quality-variants will be based on the modified rocket silo.

For the wagon scaling, I currently simply enable a flag that allows those to scale with the default modifier defined in the quality prototypes (ie. 30% unless another mod modifies that). I think you can add custom scaling for specific properties to the quality prototype, but that might be outside the scope of this mod.

I could probably add a string setting accepting a lua table (or similar) for modifying eg. fluid_wagon_capacity_multiplier of each quality prototype according to some formula (eg. 0.1*level), but I guess that if you can make efficient use of that, you might as well add your own custom mod to change those definitions...