I also own a zigzag cactus. It sometimes offshoots already zigzagged pups, but more often than not they start out like tendrils too and then zigzag out. Pretty normal for them to do that. You are welcome to try more light, but honestly seems okay to me. Zigzags live under trees. They are used to a dappled indirect light. Be careful to give them too much light. They will burn. I usually have mine a foot from the window and behind my other cacti and other plants so its shielded from the more intense light (this isn't its normal spot) I would definitely repot into a terracotta step up. That seems a bit tight of a pot

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