If only the ridiculous SNAC nerf didn't make the gun completely useless compared to any other bomber weapon, SHFs would have a direct counter. Their only real weakness was that they were significantly easier to hit with damage nukes like SNACs, countering their high armour.
Right now they're simply very strong because they don't have a weakness other than a larger hitbox, but in smaller fights/duels that doesn't matter. Only really experienced players can maneuver well enough to take advantage of the SHF being a bit slower than the rest, and the armour they get mitigates the hitbox disadvantage considering snubs don't deal a lot of damage.
An LF could make it easier to outmaneuver it, but that would take ages as LFs don't deal damage and are unlikely to win because they die to one mine that's easy to set up. A HF is just a nerfed VHF. A gunboat will have an easier time, but it's really frowned upon to fight fighters in a gunboat for reasons in this community - and nobody would duel a gunboat in a small fight anyway.