[argyllcms] Calibration issues using argyll

I've been using ArgyllCMS for quite a while now and have already posted some messages to this list concerning various topics. Especially the one I'm about to adress has been on my mind for quite some time now.
My TFT is an Eizo S2431W and I have used the Spyder2 and, since the results where not as good as expected, have purchased a DTP94 later. What bothers me is that I cannot be sure the results I obtain using argyll are correct, or in any way, better that the ones with the proprietary software (iColor Display). What concerns me is the following: when I calibrate my display with argyll, neutral gradients seem to have a slight greenish color cast in the dark tones compared to the results produced by iColor. This is consistent through a few months of using argyll, the results are always the same, so it has to be systematic.
The next thing is the profile created. Argyll measures quite different color rendering abilities than iColor does. With argyll, the gamut seems to shift quite a bit towards green and blue, covering less of red to yellow tones. These results also are very consistent. For the creation of the profiles, Argyll scanned in alot more test patches (2000) than iColor did (roughly 80-100?). These were also the profiles used in the comparision I link to at the end of this message.
While I certainly would put more confidence in Argyll regarding the profile, the calibration seems to be a bit of a problem. Now, I have tried several approaches when calibrating, and the slight colour cast also remains if I do not calibrate at all but just use targen, dispread and colprof to create the ICC.
I was wondering if there was anything wrong with the commands I use or if you could give me any other hints regarding this topic. 

Thanks in advance,
Steffen


My commands used:
dispcal -yl -v2 -p.5,.5,2 -qh eizo
targen -v2 -d3 -f400 -c none eizo
dispread -v -yl -k eizo.cal -p.5,.5,2 eizo
colprof -v -A "Eizo" -M "S2431W" -D "20080909, Gamma 2.4, Native" -qh -bh -as eizo
Profile comparision: http://www.evilstiefel.de/pics/argyll/profiles_compare.jpg

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