smoke should be more related to "loading" of the engine.
not necessarily rpm related.

kind of like turbo boost not coming into play until loaded.

you can rev the engine all day long in neutral and the turbo won't produce boost, and you shouldn't really smoke much.

Now accellerate going up hill, and it should be smoking all through the power rpm band, not just at 3,000 rpm. In fact, at higher rpm, and the torque demands decreasing with speed, there ought to be less smoke.

on a flat surface or going down hill, it might not smoke at all.

Advance makes a big difference in power and smoke too. These are smoky dirty engines when set 'correctly' pretty old tech. but very reliable.