Instead of weight have a similar but more recognisable PP's format for ships with weapons.
PP's limit of say 10 to 100% where this value is times by the planet value times 20 PP's.
So at 50% and 50 planets this would be 25 x 20PP's with a possibility of building around 25 heavy carriers / Merlin combos (less if HC over 20 PP) when the rest of the ships would be made up of freighters as they do not have weapons and are free.
A 100% would mean all of the slots could be filled with HC's biasing HC races.
10% would mean very few HC's could be built so biasing the low PP races.
I suggest two options for the PLS system.
PLS minimum limit. Say 50 planets as suggested.
Instead of weight have a similar but more recognisable PP's format for ships with weapons.
PP's limit of say 10 to 100% where this value is times by the planet value times 20 PP's.
So at 50% and 50 planets this would be 25 x 20PP's with a possibility of building around 25 heavy carriers / Merlin combos (less if HC over 20 PP) when the rest of the ships would be made up of freighters as they do not have weapons and are free.
A 100% would mean all of the slots could be filled with HC's biasing HC races.
10% would mean very few HC's could be built so biasing the low PP races.