Tested this with Lemon and wishender, weapons with champion mods (unstop bow in this case) should receive overcharge bonus when overcharge is enabled but exotics with intrinsic champ mods seem to not benefit from this. Unfortunate as this makes e.g. graviton lance an objectively better choice over e.g. lemon in this scenario.
Seems like a bug?
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Le Monarque doesn't receive benefits from the Unstoppable artifact perk since it already has intrinsic Overload.