Connecting notes on separate staves...

[Rick Hogg]

Hello,
I've come across a problem.  I'm using cross-staff beams, in conjunction with voices using << \\ >>, but the note from the top staff doesn't line up with the notes from the bottom.  Have a look:

%%%%%%%%%%%%%%%%%%%%%%%%%
\version "2.8.3"

\layout { ragged-right = ##t }
stemExtend = \once \override Stem #'length = #14
noFlag = \once \override Stem #'flag-style = #'no-flag

upper = \relative c' {
    \clef treble
    \time 6/8
    \key a \major
    << <f a d>8-. \\ \stemDown \stemExtend \noFlag e8 >> r r
    }

lower = \relative c' {
    \clef bass
    \time 6/8
    \key a \major
    <d b>8 r r 
}

\score
    {    
        \new PianoStaff
 <<
            \new Staff = "upper" \upper
            \new Staff = "lower" \lower
        >>
    }
%%%%%%%%%%%%%%%%%%%%%%%

How do I move the bottom notes to line up with the top one?

Thanks,
Rick

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