A Full Lashing might seem very similar to a Basic Lashing, but they worked on very different principles. While one had to do with gravitation, the other had to do with the force (or Surge, as the Radiants called them) of adhesion-binding objects together as if they were one. I believe this Surge may have had something to do with atmospheric pressure.
To create a Full Lashing, a Windrunner would infuse an object with Stormlight, then press another object to it. The two objects would become bound together with an extremely powerful bond, nearly impossible to break. In fact, most materials would themselves break before the bond holding them together would.
I believe this may actually be a specialized version of the Basic Lashing. This type of Lashing required the least amount of Stormlight of any of the three Lashings. The Windrunner would infuse something, give a mental command, and create a pull to the object that yanked other objects toward it.
At its heart, this Lashing created a bubble around the object that imitated its spiritual link to the ground beneath it. As such, it was much harder for the Lashing to affect objects touching the ground, where their link to the planet was strongest. Objects falling or in flight were the easiest to influence. Other objects could be affected, but the Stormlight and skill required were much more substantial. This is a work of fiction. All of the characters, organizations, and events portrayed in this novel are either products of the author's imagination or are used fictitiously.