If using at least 8 tiles of runway, jump before going down the first slope. If using 7 tiles of runway, Samus will get a higher jump; in this case, jump later, after going down the first slope

Entrance condition:

{
  "comeInRunning": {
    "speedBooster": true,
    "minTiles": 6.4375
  }
}

Requires:

"canCrossRoomJumpIntoWater"