Tighter adjustment means more line pressure. That’s means a more firm clutch or band application, more holding effort. Each full turn is around 1 to 1-3/4 more psi depending on spring condition.
The dimension shown in the snip from the B&M instructions is based on a different regulator spring supplied with their kit, the stiffer blue spring from the kit would yield more like 4-5 psi for each full turn.
