Stop the snail when it is on the lower part of the overhang (hug the snail to gain extra jump height). Climb it by waiting until it is just about to become active to jump.

Requires:

{
  "notable": "Bootless Suitless Snail Climb"
}
"h_canNavigateUnderwater"
"canSnailClimb"
{
  "or": [
    {
      "obstaclesCleared": [
        "A"
      ]
    },
    "h_canUsePowerBombs"
  ]
}

Clears obstacles: A