no, you cannot fractal the sparks. "The spark or ball lightning will attack and die in the same turn in which it was produced."
seiya, a successful attack is when damage is done, much like when applying poison. and more to that point, a forest scorpion could be more powerful in a vacuum than this card, as the poison will continuously get bigger, while the sparks stay the same size.
i wouldnt have an issue lowering the atk of the upped version, but the cost would go down too.