Self produced weapons in loot table, how to tweak it?

[ste636]

I made the mistake to sell some of the weapons I made to see how they will be shared among vendors, but now they are spamming the shops and the tournaments, they are super common and they take away slots to "vanilla" weaponry.

I would like to tune it waaaay down so that they become really rare to find, or delete them completely from the loot tables.

Any suggestion?

Thanks