You also mentioned [quote=Max Shadow]another note about his lightning, both his ability to charge it fully while still fighting normally, and it's base power that you stated is "capable of outright killing a human, leaving burn marks and smoke rising from their remains" mixed with your fighters ability to use it as an essentially unblockable/undodgable attack comes across as op in my opinion. as seen when you one hit killed the only opponent you actually killed.
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A .45 ACP is also capable of killing a human in one hit, and if you load it with incendiary ammo, it'll create the smoke and burn marks too. Killing a human in a single attack isn't a great feat, it's pretty standard for any kind of offensive power, especially in the intermediate tier. Anyone with a .45 can launch half a dozen such attacks in a single post if they so choose, and I'm limited to two (one per hand). Contrary to movie lore, two successive hits from a .45 and you won't be walking away from it. There's an off chance you'll get carted away in an ambulance, but even that's pretty slim. An attack from a .45 ACP is also just as un-dodgeable for a character with the speed yours possesses as a lightning bolt is. The only thing missing in an attack from a .45 ACP loaded with armor piercing ammo (that is present in an attack from my lightning bolt) is the intermediate-tier telekinetic that can curve the bullet (or the killer from wanted, who might not even be intermediate tier).

Point is, being able to guide my lightning on a pre-determined course is no more OP than being able to do the same with a bullet. What would be OP is if I could change the pre-determined trajectory mid-flight in order to continue the attack on a target fast enough (or lucky enough) to avoid it.

All that said: You may be right. Arty's current powerset may be OP. This is the first fight I've used it in, so there was nowhere else to work out the kinks. Even if he is though, he wouldn't be the only one, and I'm going to use him at the level he was approved for.