After entering the room with X-Mode, begin arm-pumping. Samus will initially move several tiles to the right and then appear to be stationary walking in mid-air. Continue to arm pump until Samus starts to move forwards again, indicating the far end of the room has been reached. Stop arm-pumping when Samus is 1 tile away from the first ceiling grapple block and release dash to cancel X-Ray and land on the far right door platform.