Balancing can be a very difficult task, as people can have a different view on weapons depending on their playstyle.
For testing, I'd recommend letting some people trying out and see what their opinion is about them. (which is probably your intention with your attached file)
For balancing, I recommend testing it with similair weapons that are available at the same tier, and trying them against the same kind of enemies available at that tier, and see how they compare together.