This should be looked at.
Everything beyond 4 is scaling too fast, leading too extreme values at the end.
I think it would better to scale a little more like this:
1-4: remain as is
5: 50kg
6: 90kg
7: 140kg
8: 210kg
9: 320kg
10: 450kg
Remember: this is carrying capacity - not maximum liftig capacity.
Therefore it should not be too extremely high.