The upgrade is not immediate, it triggers later a bit, the thread gets +50% and it is noticable. Which level are you on? A week sounds too hard, maybe I was simply lucky with a playtest, I can look into it in case it needs a bit of nerfing.
Plan is to make those choices permanent though, thats a bit evil, the original idea is to add a New Game Plus when everything is done, where you can add more or different upgrades make it easier to finish with different dialog choices. Also thought about a gui where you can turn them on and off, but it is not yet completed. Adding a gui and a way to “rearrange skill points” is also an interesting idea though, a good choice for a specific level can help a lot.