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So the snak character build is +5 for narrow entries but is nerfed when the exit is a hole in the ceiling of a larger cavern, an area where the ballon is +8. Ultimately what we need is a hybrid build between ballon and snak, an inflatable snak ballon if you will, should be +3 on both. The second win is that snak motility can be driven by controlled focal inflation/deflation cycles.

See https://www.vinerobots.org/ which work like a 触手 (tentacle monster, pronounced shokushu) from an H anime.

Looking at the pictures below, it does look like they need something more narrow for realistic cave use, but they probably will need greater lift than what they get with their current low surface area shape.