Improving this upscaling script

[Nozdrum]

Recently I started using AvsPmod and I'm testing this script to upscale anime from DVD 480p to 720p (4/3):

FFVideoSource("Input")
TemporalSoften(4,4,8,15,2)
nnedi3(field=-1, dh=False, Y=True, U=True, V=True, nsize=6, nns=1, qual=1, etype=0, pscrn=2, threads=0, opt=0, fapprox=15)
nnedi3(field=-1, dh=False, Y=True, U=True, V=True, nsize=6, nns=1, qual=1, etype=0, pscrn=2, threads=0, opt=0, fapprox=15)
LimitedSharpenFaster(ss_x=1.5, ss_y=1.5, dest_x=last.width, dest_y=last.height, Smode=3, strength=100, radius=2, Lmode=1,
 wide=false, overshoot=1, soft=-1, edgemode=0, special=false, exborder=0)
LimitedSharpenFaster(ss_x=1.5, ss_y=1.5, dest_x=last.width, dest_y=last.height, Smode=3, strength=100, radius=2, Lmode=1,
 wide=false, overshoot=1, soft=-1, edgemode=0, special=false, exborder=0)
Spline36Resize(960, 720, src_left=0, src_top=0, src_width=0, src_height=0)
LimitedSharpenFaster(ss_x=1.5, ss_y=1.5, dest_x=last.width, dest_y=last.height, Smode=3, strength=100, radius=2, Lmode=1,
 wide=false, overshoot=1, soft=-1, edgemode=0, special=false, exborder=0)

This is a comparison of the result:
http://imgur.com/a/bI2OW#0
http://imgur.com/a/fL5aR#0

The backgrounds appear quite detailed compared to the source but, I think the lines of the clothes and the characters are a bit large, also their colors seem to be different. Is there any way to improve this kind of lines and colors?

EDIT: the problem with the colors happens when upscaling to 720p it causes the colors to change, while using a different value like 576p doesn't affect the colors:
http://imgur.com/a/cUjPU#0

I wonder is it possible to prevent this color shifting?