I have had success in the past by doing a left shift as you have, and then in the middle of the line somewhere issuing a similar right shift. The trick is to use the minimum shift necessary. So now you have -216 on the left,then in the middle of the line use a positive 216. That will require a repositioning of the fields to the right to line up on the form. Also, there is an absolute clip limit that you are NOT going to be able to exceed at all. The shifting we are doing is simple moving the printable window back and forth. Of course you have to issue the two commands appropriately on every line.
I seem to recall that there are some HP printers that make available ALL of the available printing space whereby you wound only need to issue the command once.. Perhaps Chris H. would remember the escape sequence. Chris?