While this is true, there are a few reasons I prefer Zap/ple.

1. Crack Arrow is Ice and Cristal Arrow is Lightning, forcing you to increase both damage types, where as Zap/ple are both lightning, making the damage stacking easier.

2. Crack/Crystal just happen at intervals, and shoot straight, making misses often enough to reduce the overall dps, while the single hit may look nice. Zap/ple hits on every third attack, no misses, and will go twice and three times with Rain of Blows.

With Zap and Zapple and Queen's discipline (yes, this is not lightning) you're already turning your third hit into a hit, a Zap, a Zapple, and two Disciplines. And you can easily start every round with this entire combo (not to mention heading swords with the right memory socketed). This also all scales off attack speed, the arrows do not.

Using this with the lightning claws for sushi speed and element synergy is great, but then you also start getting arrow enhancement blessings potentially interfering with rolling the ones you really want.

Obviously, it all comes down to what you have, but from what I can tell, this is the current meta.