I say let the bottom tree Knife Juggler One Hit to the head for a season.
This can give hunters a OHK ability that already requires skill and restrict it down to the OG 3 Shot GG. It's a skill shot anyways and I'd say it won't be too broken, just don't run right at the guy and most of us should be fine.
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As a Hunter main, I'd love to have this but only if it's conditional, otherwise it would be OP especially on bottom tree. In line with the general Hunter fantasy, I would only make it an OHK on crit if the target doesn't see me. Since we don't have invisibility on that subclass, that would have to mean a sneak attack from behind, the side, or above. Should give a means to counter in 1v1 by just facing the hunter, and play into the hunter/prey fantasy. Other options might be to have it charge like a handheld supernova on top-tree, narrow the spread significantly on middle-tree, or even have the three knives thrown in sequence when charged, also on middle tree - both would require that all three have to hit to secure a kill, say 64/knife or so.