Dowsing slots full
Not sure you get the heart dowsing on hero mode (cause there's no hearts), even with the two heart medals fi doesn't activate it...
Another thing too, I think the hero mode used for a 100% should be clean, i.e. no bugs and no "treasures" from a previous save.. That would be a bit lame else, just selling few treasures to get max rupees and spend 10 minutes at workshop to just upgrade all items and that's it..
But well, this means you'll get the treasure get cutscene at every segment (derp this is a lizard tail it's a tail from a lizard and it's spiky houuu)