Help with espressivo adjustments

[SoundsFromSound]

Hello all,

I'm trying to adjust the length (not /size/, per se) of the espressivo
markings in this particular score and I can't figure out what I'm doing
wrong.  

I've checked out a previous thread here:

http://lilypond.1069038.n5.nabble.com/Changing-hairpin-size-in-espressivo-td21181.html

...however, that override solution seems to increase the overall size of the
hairpins, not simply /elongate /them (horizontally only).

Ideally I would love to be able to make my espressivo markings just a little
bit longer without making them increase in height/size as well. 

The images I attached show a) how the hairpin is too large for what I'm
trying to achieve using the override; b) the default LilyPond espressivo
size; and c) ideally what I am trying to do.  

Is there a way to only elongate/stretch espressivo markings similar to how a
normal hairpin would appear generally?

Could someone help me with this?

Thank you for any help, much appreciated.

Ben

my code:
_____

\version "2.17.15"
\language "english"

\relative c'' {
  \override Script #'font-size = #+8
  c e f\espressivo g |
  f e g f |
  
}

_____

<http://lilypond.1069038.n5.nabble.com/file/n144373/too_large_hairpins.png> 
____
<http://lilypond.1069038.n5.nabble.com/file/n144373/default_lp_esp.png> 
_____
<http://lilypond.1069038.n5.nabble.com/file/n144373/rough_idea_of_my_goal.jpg> 
(rough idea of what I would like to do)



-----
composer | sound designer
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