HP laser jet workstation custmization object changes

I need to increase the space between lines on printouts sent to a
 HP4500N laser that is connected to an AS/400 via TCP/IP using a
 Jet Direct card over Ethernet.
 
 It is defined as a 3812 model 1 on the AS/400.
 
 I retreived the workstation customization object by the following
 command:
 
 RTVWSCST DEVTYPE(*TRANSFORM) MFRTYPMDL(*HP4) SRCMBR(PRT16)
 SRCFILE(QTXTSRC)
 
 I then modified the source as follows to increase the font size:
 
     :CPICOR
       CPI=10
       ASCIIFNT=  201
       FNTWTH=   110
       FNTATR=    1
       DATA =''X.
     :CPICOR
       CPI=12
       ASCIIFNT=  201
       FNTWTH=   110
       FNTATR=    1
       DATA =''X.
     :CPICOR
       CPI=15
       ASCIIFNT=  281
       FNTWTH=   110
       FNTATR=    1
 
 I then created a *WSCST named PRT16 using the command CRTWSCST and tied
 it to the printer via the CHGDEVPRT command, and this works fine.
 
 How can I increase the space between the lines of print using this same
 source?
 
 TIA,
 
 billy

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