Yeah, you definitely didn’t do anything wrong.
But this is why I usually err on the side of caution when it comes to optimization laundry lists. Running through massive checklists of obscure windows settings and registry hacks found on forums very often has negative side effects. I usually sift through recommendations very carefully, googling each one extensively. The changes I’m less confident about get intense A-B testing, and if I can’t measure a difference, that setting usually gets left on default, even if someone else swears up and down it fixed all their problems.