Problem with dark thin lines in x264 at low bitrates

[Nozdrum]

http://s24.postimg.org/i8p6lw9xt/17258.jpg (http://postimg.org/image/i8p6lw9xt/)

Is it possible to allocate more bitrate to that kind of lines (in clothes/hairs), detracting it from the backgrounds?

x264 settings:
--chroma-qp-offset -4 --b-adapt 2 --ref 10 --qcomp 0.70 --qpmin 10 --qpmax 51 --me umh --crf 27 --tune Animation --preset veryslow --bframes 8 --deblock 1:2 --fade-compensate 0.35 --aq-mode 3 --subme 10 --trellis 2 --merange 24 --chroma-qp-offset -4 --threads 2 --keyint 250 --min-keyint 12 --scenecut 45 --aq-strength 0.75

[raffriff42]

Line darkening? (http://avisynth.nl/index.php/External_filters#Linedarkening) Don't overdo it.

[feisty2]

it's mpeg4 compression artifacts add "removegrain (11)" in your avs script and add "--deblock 2:2" in your x264 encoding settings

[Selur]

also adaptive quantizer strength is probably the option ment to assign more bit rate to the edges and away from the flat areas.
value < 1: -> less bitrate around edges, more bitrate for flat areas
value > 1: -> more bit rate around edges, less for flat areas

[Dark Shikari]

also adaptive quantizer strength is probably the option ment to assign more bit rate to the edges and away from the flat areas.
value < 1: -> less bitrate around edges, more bitrate for flat areas
value > 1: -> more bit rate around edges, less for flat areasActually it's the reverse; higher AQ strength means less bitrate for edges (though in anime, it usually makes less difference, as nearly all the bitrate goes to the edges either way).

[Nozdrum]

Then I'm going to use the default --tune animation aq-str and increase the deblock, any other suggestion for newbies like me? I forgot to metion that I'm using tMod, does it make any difference? this file has some dark scenes, I heard that aq mode 3 helps to improve this kind of scenes. About the line darkening filters, could Toon-v1.1 be the right one?

[Selur]

Actually it's the reverse;
Thanks for the correction