Just give sins only 2 pips of energy regen.
This way, a sin with high criticals and melee attacking will overcome the little regen with the energy bonus from the crits, while a sin who invested all in shadow arts and earth magic wont be able to keep the energy to permaSF.
This way you punish permasins without touching SF.
how to nerf SF
Mokeiro
Kattar
ANet is currently working on this issue. That, coupled with all the other threads about Shadow Form (seriously, just run a quick search) makes this thread unnecessary.
Closed.
Closed.