Read Locos link for a clear concise explanation.
If the fork is bouncing off small bumps and roots you have IMOtoo much compression damping.
You need to adjust one thing at a time and keep repeated riding the same bit of trail.
Low speed compression is for brake dive and bob mainly
High speed compression for hitting sharp bumps. ( gently undulations is a bit of both – lets just ignore that)
Get sag and rebound set up first.
With both compression adjustors backed right off ride a section which should include braking and bumps. too much dive under braking / wallowy- more LSC needed. Turn it up until the dive is gone.
Then do high speed compression. start with it on zero. ride over bumps – turn it up until it starts to bounce off bumps then back it off a bit.
Then when you get confused put everything into the midle of itts range and give up fiddling
IMO people get far too hung up sometimes on fork settings and compression damping is in many ways the least critical hence many forks do not have compression adjustment.