Revise first line table. Treat the tune title as a paragraph (ragged right). Set the column widths to give a wider and hence larger first line tune graphic. Keep using the cropped first line graphic, and introduce our own gaps between lines to keep the tune separations clear. I did look at using the grpahics borders, but that gives left and right margins too.

X: 1
T: Exploding Potato, The
C: Ed Pritchard
N: Change: ExtensionReel.abc
M: C
L: 1/4
Q: 180
K: Gmaj
"G" d B/G/ d B/G/ | d e d B | "Am" A>B c A | "D" D B c ^c |
"G" d B/G/ d B/G/ | d e d B | "D7" A>B c A | "G" G2 G2 :|
"D" A>F D D | "Em7" B>G D D | "Am" A B c e | "D" d B "G" [gBD] z |
"D" A>F D D | "Em7" B>G D D | "D7" A B c F | "G" G2 G2 :|