In the code you posted, the part that is ...&l2a8c1E
the 8c bit is the line spacing; i.e., 8/48ths of an inch or 6 lpi.
The font is set to 10 picth. I am very doubtful that the setup that you posted is can produce a text width as great as you by inserting the codes on every line.
Use the setup you have, goto 12 ptich and see how many characters you can get on the full line. Now if your original problem could be resolved with a narrower right margin gained by a fatter left margin, then <esc>&l65U at the beginning of file would probably fix you up.
Jim Asman
jlasman@telus.net