This mod could have been great but for some reasons the yield go crazy and I don't want that. I tried to put ressources at minimum levels but the yield is still too high....

If you mean by yield that 2 miners can fill a blue belt, i agree with you. Its annoying and im trying to find an alternative to this mod. Otherwise this mod is perfect.
To the mod author: if you have the time, please take a look at this problem.
Anyhow thanks for your mod. It was amazin as long as it last.

I don't think this is a fault of the mod itself, but rather a change in how infinite resources are handled by the game. Very unfortunate.

Edit: Ah, and here's the change:
https://forums.factorio.com/viewtopic.php?f=3&t=74526&hilit=infinite

Fixed that infinite item based resources with yield of more then 100% didn't actually mine more. So yield of 260% for example means that it mines 2 resources and 60% probability of 1 extra.

Because I finally decided to do something about it: https://mods.factorio.com/mod/InfiniteResourcesNormalYieldDepletion