The errata v1.4 for climbing and jumping states: When measuring Jump or Climb movement, you can measure from any point of the Trooper's Silhouette at the start of the movement, but you must measure to the base's outer edge and underside at the end of the movement. Am I interpreting it correctly that you cannot climb/jump as far downwards as you can upwards (since upwards you get to measure from the top of the silhouette to the bottom)? If so this feels counterintuitive to me.
As the FAQ is written, it is correct that jumping downwards is a lot harder than jumping upwards, yes. Climbing, however, should work the same way when getting off the wall (downwards) as when getting on it (upwards) if you start the process of getting off the wall far enough down. It's a little bit odd.
Wouldn't climbing work the same as jumping? For example, a model in silhouette contact with a wall climbing upwards with move 4" would end their movement 4" + silhouette height at the highest point. When climbing downwards (from the perfect spot to use all its movement) the same model would only move 4" - base size, right?
Not entirely. You can measure from any part of your silhouette at the start of the movement. What this means is, if your Bronze is standing horizontally on a wall, right next to the floor, you'll be able to start the movement 1.75" away from the wall - just like if the situation was rotated 90°.