Bounceball into the Lava, unmorphing with good timing to sink faster and drift efficiently towards the bottom right Namihe. Wall jump at about eye height (4 pixel window) to gain enough height to reach the center portion of ceiling. While rising, wiggle to shrink Samus' hitbox. Some walljump positions will not need to wiggle, when wall jumping far away from the Namihe. Jumping, from the wall, around the next lowest overhang is very precise and taking any extra time to position will increase the amount of lava damage being taken. It may help to disable Hi-Jump for this part. Then wall jump again to exit the lava and reach the left ledge.