WotS is a very powerfull ability but it is highly situational and highly map dependant.
You need a least a desert or terran planet to do reasonable damage and you loose it afterwards. On some maps it is basically useless because the only planet with enough population is your capital... on others it is truelly frightening.
My suggestion would be to keep its current damage, possible an damage increase on smaller planets but:
1. Nice graphics... a shockwave traveling to the adjacent gravity well and with that a delay until it hits that gravity well, so you have a change to run
2. A nice sound effect to all players who are in those adjacent gravity wells... something like and advisor warning " A giant psionic shockwave has been detected!
