Lilypond - chord progression

[Christian Henning]

Hi there, I'm almost finished with my first lilypond piece. I'm quite
happy with the results. But, there are a couple of questions left
regarding the output. Please consider the following piece:

\version "2.12.2"

#(ly:set-option 'delete-intermediate-files #t)  % deletes the .ps file
automatically

\header {
        title = "Title"
        composer = "Band"
}

<<
\new ChordNames {
\chordmode
        {
                \set chordChanges = ##t
                g1 |
                g4.:sus4~g16:sus4 g2~g16 | \break
                bes1 |
                bes4.:sus4~bes16:sus4 bes2~bes16 | \break
                c1 |
                c2:sus4 c2| \break
                c:m |
                c:m |
        }
}

\new Voice \with
{
        \consists Pitch_squash_engraver
}
\relative c''
{
        \improvisationOn
        g4 g8. g16 g8 g~g16 g g g
        g8. g16 g16 g g8  ~ g16 g g g g4
        g4 g8. g16 g8 g~g16 g g g
        g8. g16 g16 g g8  ~ g16 g g g g4
        g4 g8. g16 g8 g~g16 g g g
        g8 g8 g8. g16 g16 g16 g8 g4
        g4 g8. g16 g8 g~g16 g g g
        g4 g8. g16 g8 g~g16 g g g
}
>>

Here are my questions.

1. In the first and second line inside the 2nd measure the second
chord is hovering to far to the right over the tie. Is it possible to
have the chords above the note where the tie starts?
2. In the last line and 2nd measure. The c:m is missing. Why?
3. In the \header does lilypond have options for putting down what the
guitar is tuned too? Also, not necessary for this piece, but how can I
state where to put a capo?

Thanks again everyone who helped me out so far,
Christian