They are called boost for a reason. The boost tab reduces the load on the pilot or servo. Their use can actually be compared to the use of a servo with no tab present. They're all either up to the job or not. And the effect of the boost tab can actually be compared to the effect of any surface, because they aren't much different than the surface they "boost". They are either up to the job or not.

Understand surfaces.... understand trim tabs.... understand boost tabs (something quite different than trim tabs).... understand linkages.... understand stalls.... there is certainly a lot to understand.

When you don't have a stronger servo....... lots to understand.