The "\%" in your $mogrify_spec isn't doing what you think - it results in the format string containing a "%". Even if you put a backslash in the string via "\\", that's not what you want:

$ perl -wMstrict -e 'print "foo %2.2f\% %s\n"'
foo %2.2f% %s
$ perl -wMstrict -e 'printf "foo %2.2f\% %s\n", 40.04, "bar"'
foo 40.04%s
$ perl -wMstrict -e 'print "foo %2.2f\\% %s\n"'
foo %2.2f\% %s
$ perl -wMstrict -e 'printf "foo %2.2f\\% %s\n", 40.04, "bar"'
foo 40.04\%s
[download]

See sprintf: The way to escape a percent sign in a format string is "%%":

$ perl -wMstrict -e 'print "foo %2.2f%% %s\n"'
foo %2.2f%% %s
$ perl -wMstrict -e 'printf "foo %2.2f%% %s\n", 40.04, "bar"'
foo 40.04% bar
[download]

(I'm a little surprised Perl doesn't warn about this, because there are several other warnings about bad format strings and such...)

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