I switch the textures to 4096, and Bam! Oom! I really don't notice much of a difference AT ALL from "4096" to "OFF". There may be a few blurries, but it is worth it!
Which texture resolution you chose when installing CYVR ? If you chose sizes smaller than 4096, it's fairly normal you won't see much difference on the scenery, your CYVR texture were *already* running at a lower resolution.
So, what the 4096 switch in this case did, is to disable support for 4096 textures ELSEWHERE in the sim, not on CYVR! For example, in the VC, in the airplane livery (if you used an HD livery), in clouds (if you used HD clouds).
Of course, if you turn off the Addon Manager switch, there wouldn't be any point installing CYVR to anything other than 1024 for every kind of textures, since you won't see textures higher than 1024 anyway, if the switch is Off.
The whole point of having that switch, is that you can SEPARATELY control the texture resolution at CYVR using the installer, but keep using HD textures for all the rest, if you want to.