I then have to re-form the shape of the connector so it will fit into the plastic part of the Powerpole as the crimper flattens it slightly.
I left that little detail out of my description/explanation. Crimping with the spike in the split does two things. It distorts the connector and it actually separates the connector with some of the wire strands going into one side, some of the wire strands going into the other side and some strands left uncrimped in the split.
It should also be noted that using a "concave or half-moon" that is too large will also distort the connector.
Many years ago I read the instructions for using the solder-less crimp connectors which stated in part, "....when properly crimped the wire and the connector become one homogeneous mass." The definition of "homogeneous" being, "Uniform in structure or composition throughout."
When the connector is placed in the Klein (Or the identical electricians crimp tool) tool with the split in the half-moon and the spike pushing into the back or smooth side of the connector, there is no distortion and the connection has a better chance of becoming this "homogeneous" mass.
IMHO, the crimping tool with the "spike" is better than the two half-moons for crimping solder-less connectors like the Power Poles. Many crimpers use the two half-moon or octagon design but they are usually used on cable where it's undesirable to crush whatever is in the tool unlike the solder-less connectors we're talking about.