Can you try to set up your printer with the "Generic PCL-6/XL printer"? Check whether 1200 dpi works with this driver.
Try also the "Brother HL-1040 Foomatic/hl7x0". Does the highest resolution setting there work for you?
Can you try to set up your printer with the "Generic PCL-6/XL printer"? Check whether 1200 dpi works with this driver.
Try also the "Brother HL-1040 Foomatic/hl7x0". Does the highest resolution setting there work for you?