I'm going to warn you: this reply will probably be of no help to you.
Have you tried write shorter, more summarized letters? I say this because it may take less time writing up a paragraph answer than searching for a canned one for every topic. Plus, I imagine if someone else sends the same canned letter, it will lose a lot of its effect.
I've never written letters before, so perhaps they do need to be longer and well-sourced.
Don't allow leftists to play games with definitions! Some of the
libertarian-leaning leftists at this forum will try to redefine
"left-wing" back to its original defition (Third Estate, limited
government, free-markets, laissez-faire reforms, etc.). Fine! We
non-leftists can't stop them from using their own personal definitions;
they can use whatever labels they want to describe any concept they
want.
However, they have the audacity
to then use their personal definition of "left-wing" (remember, the original
definition, which is no longer valid) to prove that modern leftists are
more libertarian than modern rightists! They will say that
libertarianism is "inherently leftist" (again, using the original, no
longer valid definition), and use that to insist that we should prefer
and side with modern leftists over modern rightists.
Question their motives.