Road Force Balance and what it means to vehicle dynamics

At 20 mph, the tires are hardly doing anything - they are more like solid wheels - and therefore, road force isn’t a factor. If you are feeling a boucniness at that speed then it is something other than the tires. I wonder if the low speed circuit in the shocks has failed. That would make the shock stiff for slow inputs, but normal for the usual and high speed stuff.