vertical alignment in chemfig reaction scheme

Question

The vertical alignment for my reaction scheme is all over the place.

1. The horizontal bonds should be in one line
2. The OH-group's bond is further away from the C-atom then the O
3. There's a gap between the oxygen in the polyamide 12 polymer and the carbon atom
4. The names don't line up

EDIT: As @cgnieder pointed out, using \chemnameinit{} solves issues 4.

MWE:

\documentclass[11pt, a4paper]{scrbook}

\usepackage[left=27.5mm,right=16mm,top=30mm,bottom=30mm]{geometry}
\usepackage[english,main=ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}


\usepackage{chemfig}
\setchemfig{fixed length=true, atom sep=1.5em, arrow offset=6pt}


\begin{document}

\small
\chemnameinit{\chemfig{\vphantom{N}-[@{li}]N(-[2]H)-{(}CH_2{)}_{11}-C(=[6]O)-[@{re}]}}
\schemestart
\chemfig{\mathit{n}}
\chemname{\chemfig{NH_2-{(}CH_2{)}_{11}-C(=[1]O)-[7]OH}}{$\omega$-Amino-Laurylsäure}
\arrow(.mid east--.mid west)
\chemname{\chemfig{\vphantom{N}-[@{li}]N(-[2]H)-{(}CH_2{)}_{11}-C(=[6]O)-[@{re}]}}{Polyamid 12}
\polymerdelim[delimiters={[]},height=25pt]{li}{re}
\+
\chemfig{\mathit{n}}
\chemname{\chemfig{H_2O}}{Wasser}
\schemestop
\chemnameinit{}

\end{document}

Answer 1

This should be what you are looking for:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{chemfig}
\setchemfig{fixed length=true, atom sep=1.5em, arrow offset=6pt}
\def\x{\vphantom{C}}
\begin{document}
\chemnameinit{\chemfig{\x-[@{li}]N(-[2]H)-\x|{(}CH_2{)}_{11}|\x-C(=[6]O)-[@{re}]}}
\schemestart
    \chemname{\chemfig{\x\mathit{n}\ NH_2|\x-\x|{(}CH_2{)}_{11}|\x-C(=[1]O)-[7]OH}}{$\omega$-Amino-Laurylsäure}
    \arrow(.base east--.base west){0}[,0]\x\arrow(.east--.west)\x
    \arrow(.base east--.base west){0}[,0]
    \chemname{\chemfig{\x-[@{li}]N(-[2]H)-\x|{(}CH_2{)}_{11}|\x-C(=[6]O)-[@{re}]}}{Polyamid 12}
    \polymerdelim[delimiters={[]},height=25pt,depth=30pt]{li}{re}
    \+
    \chemname{\chemfig{\mathit{n}\ H_2O}}{Wasser}
\schemestop
\chemnameinit{}
\end{document}