TC
Vortex: they are STATIC trim tabs, which allow engineers to 'tweak' them by bending them to allow the blade to fly in harmony with the other blades in the horizontal plane. In the ends of each blade there is a tip cap. Inside this tip cap can be found mini weights (shot or lead blocks) these are DYNAMIC trims. They assist in flying the wing in the vertical plane. New generation helos can adjust some of these settings whilst in flight
Something to do with voodoo magic
Not quite. The trim tabs are to get all the blades flying in the correct plane (tracking), which is carried out along with PCR adjustments, the weight chambers are to adjust the weight of each blade (balancing).
Most blades have static trim tabs and static weight chambers (which are set up at the factory, and none adjustable) and dynamic trim tabs, dynamic weight pots/washers which the engineer can adjust.
A combination of adjusting all three on the ground, some measurements at flight idle/hover/ differing speeds and then some more adjustments should hopefully have your helicopter flying smoother, help preserve wearing of components and keep your vision clear....
