Setting ride heights on a 1/10 buggy

[Novamartin16v]

Hi
May seem a silly question but need to ask.
Used to race 20yrs a go but this was on carpet & tarmac.
Just bought a buggy again & local track is off Road on Astro & very foreign to me.
I have been setting height static on a board with a gauge as I did 20yrs ago on carpet.
Is this correct for off road or should I be dropping from few inches then setting heights as there is a massive difference in the static height to dropped height.
Little confused so any advice appreciated
Thanks
Martin