I use that guide as well. I have made my own tweaks that increase the quality and significantly reduce blocking on dark scenes, while maintaining detail.
It would be easier to try and fix the problem if you can explain why you don't feel the quality is that great. BUT - if you want to try out my settings and see if it makes any difference, here they are.
In Advanced Settings:
Change CPU Preset to Ultrafast
Put the following into the Custom X264 Encoder settings box:
Code:
tune=zerolatency crf=17 keyint=15 aq-mode=1 aq-strength=2 deblock=-3:-1
tune=zerolatency -- Because I've always used this.
crf=17 -- Generates great quality, bitrates typically go up to 50-60MBps, but I've seen it peak around 75MBps.
keyint=15 -- Youtube previously suggested keyint at half the framerate, I record 30fps, so this is 15 for me.
aq-mode=1 -- Turn on AQ, as Ultrafast preset turns this off I believe.
aq-strength=2 -- Fixes the ridiculous blocking during dark scenes.
deblock=-3:-1 -- Retains detail sometimes lost during deblock by altering the strength. May make some details slightly more blurry, but TBH I have no noticed any blurring.
At 1080p30, this uses about 8-14% CPU usage on my i7-3770k, no overclocks.