Trying to understand how springers work, cup faced piston seals are one of the mysteries I want to understand better.
What do they really do differently than "normal" piston seals?

In my simple mind, they act as follows:
-they may reduce static compression, as they introduce lost volume?
-they increase flow, as they dont shut off the transfer port like flat faced seals?
-the compression reduction may reduce bounce, and thereby actually cause a power increase?

Does this sound logical?
What am I missing?