You cannot have Qe/Ci without the Bronya driver. The strings are only replacing Injectors, like NATIT. Injectors only give you resolution changes.
You aloso need all kext from bronya driver except NATIT.
In my case everything working fine, even Quake 4 for example.
i did some testing and found that quicktime 7.5 doesnt like the string for some reason. 7.4 works fine but if i upgrade i get that picture quality. i tried using all of bronya's files minus natit and got the same result. but if i use natit it works fine. so i now just use 7.4 and atiradeonx1000.kext and atirndrv.kext and it works perfect. thanks for the string. boots far much faster and the spinning wheel now shows up properly