shipping rates

Good evening!
If I had one comment to make right now, it would be about the shipping rate system. The price difference, for France as an example, between a 20g letter and a 100g letter is quite significant. Currently, we have no choice but to use the 100g rate by default, even if the package weighs 20g or less. To give you an idea, here are the rates for tracked letters: €1.99 for 20g and €3.47 for 100g. The buyer is really losing out. Why pay €3.47 for a stamp for four cards when they could pay €1.99? 

It would be advisable to adjust the shipping costs: 
- Very small: 0-20g 
- Small: 20-100g 
- Medium: 100-250g 
- Large: 250-500g 
- Small parcel: 1-2kg 
- Medium parcel: 2-5kg 
- Large parcel: 5kg+