Lightburn1.1f or change 1.1g

Should I be installing grbl 1.1f to work with lightburn & J-Tech laser ? I have 1.1g installed but cant get the laser to work ! I Have noticed that $31=1 & $32=0 in my existing grbl 1.1g ! or should I just change these to $31=1000 & $32=1 in 1.1g ? Also do I change this in ugs ? I am using Aspire & ugs for the CNC & it is working well I am a bit nervous about changing grbl settings ! I thought 1.1g was good for the laser as well.
Many thanks G