bolting technique

Both are "dynamic" till the tool stops since as long as you tighten the tool turns. What is usually called "residual torque" is not the real residual torque in an assembly. What you call residual torque is the torque required to start the blot turning either for a further increase of preload or for a preload decrease. This torque is not present in the assembly is the limit given by the static friction between bolt and sliding surfaces and the preload.

Static friction depends on different factors as surface material, roughness, lubrication, corrosion under environmental impact and time between finish of tightening and moment when the bolt is moved again.

Friction coefficients vary also with sliding speed this is the reason it was said to you that it has an influence on the "residual torque". In general a hand tightening -normal- without creeping movements is equivalent to a 20...25 rpm. Mechanical nut runners work usually at 40...60 rpm but for bolts/nuts with increased head (used especially with weak materials and to avoid a washer) the trend is to lower the speed toward 20...30 rpm in order to avoid galling due to too high temperatures on the sliding surfaces.

In all assemblies there is a true residual torque which under circumstances can lead to the loosening of the assembly !