I know the values are configurable, but I thought I'd give some feedback for the default config.

IMO, just increasing the multiplier by 1x for every tier winds up being really OP. Consider determining a final ideal maximum (100 tiles? 96 tiles?) and then scaling your levels based on that. So maybe something like 48 -> 64 -> 72 -> 96

Thanks for letting me know! I'm aware the the Logistical roboport specifically has some really big impact upgrades.
Especially the construction and Logistical upgrades. As it turns out adding the base value to each level quicky scales up in size. However I believe this does eventually require some bot speed/battery upgrades to be actually useful.

For space age I might place some of those tiers behind specific planets, just like the Energy upgrades. If there could more more detailed suggestions, i'd love to take those into consideration