your files still give "%!PS-Adobe-3.0" please try to print these files (you must do the "lpadmin -p ... -o pdftops-renderer-default=pdftops" on a print queue which actually prints on your printer). The files are then generated by an alternative program and work perhaps better on HP's printers.
Even that after
lpadmin -p test2 -o pdftops- renderer- default= pdftops
your files still give "%!PS-Adobe-3.0" please try to print these files (you must do the "lpadmin -p ... -o pdftops- renderer- default= pdftops" on a print queue which actually prints on your printer). The files are then generated by an alternative program and work perhaps better on HP's printers.