I dont have it myself yet. But based on the feedback ive seen from multiple content creators.
Mythoclast isnt the strongest option for anything atm (not that it'd stop me from using it).
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I have a idea for a buff that would give it a place in the game without being so good that its broken.
Give its base auto rifle style fire overload rounds. Then give the linear fusion shots anti barrier.
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Imo these two things would get it play time due to versatility without it being "too strong"
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For me it needs exactly one buff. Letting you store charges [i]UNTIL[/i] you enter linear fusion mode. Once you enter LF mode, use it or lose it. But you should be able to build up charges without losing them. (Think Hawkmoon, you can store the stacks until you’re actually on the final shot)