Fusion rifles dont need any more changes to damage or range values. Whats needed is a changed in their time charge time. The high impact fusions should take longer to fire and the lower impact should be more quicker to shoot. It should be more of risk to use them but they would still be effective. This way people will actually use the low impact fusions and the high impact ones will take more skill.
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Fusions the only skill you need to master is prefiring. If a fusion user is good at that which most of us are changing charge times wont matter.