Make sort order in citation call-outs independent of value of maxcitenames counter

Question

My problem is a little tricky. I want my bibliography sorted in a certain way. First it should be sorted by all authors, then by year, then title. This is working fine in most cases, but I have the situation, that I have multiple articles from the same group of researchers and sorting seems to work as follows: "sort by authors names, but only sort by the first x names, where x is the value of maxcitenames=x (in my case: 3). If the number of authors exceeds the entered value put it at the end of the articles by the first author and sort them there."

So currently the bibliography looks like

Author, Buthor, Cuthor (2010) bla
Author, Buthor, Cuthor (2011) blubb
Author, Euthor (2003) bli
Author, Buthor, Cuthor, Duthor (2006) blobb

where it should be:

Author, Buthor, Cuthor (2010) bla
Author, Buthor, Cuthor (2011) blubb
Author, Buthor, Cuthor, Duthor (2006) blobb
Author, Euthor (2003) bli

The ordering in the bibliography is correct, if I increase the value of "maxcitenames". However this increases the number of names after the quote within article (of course). So what I basically need is a syntax, which says that in the text a maximum of 3 names should be mentioned, but the sort order in the bibliography should be alphabetically and should include all the authors. I am using the citet and citep commands provided by natbib.

I hope someone can help me with that issue.

---

Additional information

Syntax:

%General
\documentclass[12pt,oneside,a4paper]{scrartcl}
\usepackage[left=3cm,right=2.5cm,
top=2.0cm,bottom=2.0cm,
includeheadfoot]{geometry}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
%Citation
\usepackage[
style=authoryear-icomp,
mincitenames=1,
maxbibnames=99,
maxcitenames=3,
dashed=false,
url=false,
ibidtracker=false,
sorting=nyt,
natbib=true, 
sortcites=false,
firstinits=false,
uniquelist=false,
backend=bibtex
]{biblatex}


\bibliography{test}
\defbibheading{head}{\section{Texts}}
    \begin{document}
    \section{Intro}
    bla \citep{Author1}
    blub \citep{Author2}
    bli \citep{Author3}
    blobb \citep{Author4}
    \printbibliography[heading=head]
    \end{document}

AND the .bib file

@book{Author1,
    title = {bla},
    author = {Author, A. and Buthor, B. and Cuthor, C. and Duthor, D.},
    date = {2009},
}
@book{Author2,
    title = {bli},
    author = {Author, A. and Buthor, B. and Cuthor, C. and Duthor, D.},
    date = {2010},
}

@book{Author3,
    title = {blobb},
    author = {Author, A. and Buthor, B. and Cuthor, C.},
    date = {2009},
}

@book{Author4,
    title = {blubb},
    author = {Author, A. and Euthor, E.},
    date = {2012},
}

Answer 1

Seemingly, using bibtex as a backend causes this problem. If you use exactly your code with biber as a backend, it works as you want.

\usepackage[
style=authoryear-icomp,
mincitenames=1,
maxbibnames=99,
maxcitenames=3,
dashed=false,
url=false,
ibidtracker=false,
sorting=nyt,
natbib=true, 
sortcites=false,
firstinits=false,
uniquelist=false,
backend=biber
]{biblatex}

Is there any particular reason that you cannot use biber, which would be the best choice for many more other advantages of BibLaTeX anyways.