Hyphenation really messed up for german text

[Stefan]

Hi!

I am using Lyx 1.6.8 on a Gentoo amd64 (hardened) profile. This is my
first post here and I tried to find a non-hackish approach to fix my
problem but failed:

I am writing a german text which results in a pdf of about 50 pages, all
is working fine but the hyphenation is really in bad shape:

For example, the word "grenzt" was hyphenated and since it has only one
syllable in german it is not to be hyphenated at all. But this is not the
only problem. I had in a previous essay of about 40 pages about three
cases of the same problem and I thought "nevermind" and ctrl+- to fix
this. This time, there is a problem on almost every single page and it is
too much to fix manually. The language is set to german, the spellchecking
is done in german, but the hyphenation is not, in my oppinion.

As a side question: is there a Lyx-way to exclude names and short
non-standard-german-word of persons from being hyphenated?

Thanks for this great program, I am looking forward to version 2.0

Greetings, Stefan

My preamble looks like this, maybe I am messing things up here:
\usepackage[T1]{fontenc}
\usepackage[lf]{venturis}

\usepackage{soul}

\setkomafont{pagehead}{\normalfont\ostyle\rmfamily\bfseries}
\setkomafont{pagefoot}{\normalfont\ostyle\rmfamily}
\setkomafont{pagenumber}{\normalfont\ostyle\rmfamily}

\usepackage[automark, headsepline, ilines]{scrpage2}
\pagestyle{scrheadings}
\clearscrheadfoot
\ohead{\headmark}
\ofoot[\pagemark]{\pagemark}
\deftripstyle{vorInhalt}{}{}{}{}{}{\pagemark}


\renewenvironment{quotation}
                 {\list{}{\listparindent 1.5em%
                          \itemindent    \listparindent
                          \rightmargin   \leftmargin
                          \swashstyle
                          \parsep        \z@ \...@plus\p@}%
                  \item\renewcommand{\baselinestretch}{1}\normalsize\relax}
                 {\endlist}
\renewenvironment{quote}
                 {\list{}{\rightmargin\leftmargin\swashstyle\fontfamily{yvo}}%
                  \item\renewcommand{\baselinestretch}{1}\normalsize\relax}
                 {\endlist}

\usepackage{paralist}
\renewcommand\itemize{\compactitem}
\renewcommand\enumerate{\compactenum}
\renewcommand\description{\compactdesc}

\pagenumbering{roman}
\let\inhaltsverzeichnis\tableofcontents
\renewcommand\tableofcontents{
    \pdfbookmark[1]{Inhaltsverzeichnis}{}
    \inhaltsverzeichnis
    \clearpage
    \pagenumbering{arabic}
}

\addto\captionsngerman{
    \renewcommand{\figurename}{\dbweight Abb.}%
    \renewcommand{\tablename}{\dbweight Tab.}%
    \renewcommand{\abstractname}{Kurzfassung}
    %\renewcommand{\nomname}{Abkürzungen}
}