So , you ha ve two choices:
1. You carry more fuel and go to the wall of shame or
2.Don`t hesitate in divert if you are at minimum fuel and you find TS over the airport or have to hold for runway cleaning up during cold weather.
In my company we are allowed to carry up to 400 kgs without justifying .Above of it , if you have a good reason as meteo for example, you can increase the uplift at your discretion.
Cheers